Database Develop

16GB MicroSD - how much will the Class affect performance?

Evening XDA!
So... It's time I upgraded my HD2's capacity. 16GB MicroSD's are now reasonably (ish! @ under £30) priced so that's what I want to go for. Most are Class 2 but I've seen a few Class 6s knocking about too.
Is the speed difference, in reality, a massive issue? Stuff I do that perhaps might require speed:
Watching XviDs in TCPMP
Taking photos
TomTom/iGO
Music
Will I notice much of a difference between the two classes of cards?
Any feedback is much appreciated! Thanks!

u just can compare my
kingston sdhc 8gb class 6
to
sandisk sdhc 16gb class 2
i could figure out a speed advantage of the class 6 about 0.8 mb per sec
my 16gb class 2 got 3.8Mb/sec
my 8 gb class 6 got 4.5Mb/sec
copiing the same file....
if somebody got different rates pls post them there.
i never had any problem with the lower data transfer rate of my 16gb sdhc, smooth vids, instant starting apps, nearly same "short" install time for apps
Ps.: i was copiing a 7xx Mb video file to my HD2 in HDD mode

I have a class 2 16gb in my HD2 - I've had no problems with the speed.
watching AVI files with coreplayer is always smooth, tomtom loads up in about 3-4 seconds.
Remember the read speed is a lot higher than the write speed.

Generally you are going to be OK with a lower class. There are however certain things that a lower class memory card will limit, like HD video playback or a high speed game installed on the card (I think Asphalt is a good example of this).
You have to decide what your going to be using the card for and adjust how much you are expecting to spend accordingly.
Be aware that if you are going for a reputable brand then buy from a reputable site. Buying a Kingston or Sandisk from Ebay for a knock down price may mean you getting a cheap knock off. Tread carefully, and give this article a good read, give you a better idea of how easy it is to buy a knock-off card.
http://www.bunniestudios.com/blog/?p=918
Hope this helps

I have been wondering the same because I have been debating on buying the new Kingston Class 10 16GB MicroSDHC card but if the HD2 can't fully utilize the speed, I will probably splurge for the SanDisk 32GB MicroSDHC card and get rid of a few of my 16GB MicroSDHC cards. It is kinda a hassle to carry around a card full of movies, card full of music, and a card full of pictures so I would love to get a 32GB when the price comes down a little more.

Anyone know any reputable sites??? I'm in Australia... So hard to find one to ship Australia and cheap!
I'm after the Kingston 16GB Class 10 card!!!

Thanks a lot for the tip guys. I'll definitely have to have a think about whether I'll need the extra speed, of the top off my head I don't think so but there's a good chance I'll be slapping a few PSX ISO's on the SD card in the future which I guess might be a factor!
@above - unsure of Aus sites, but stay away from ebay as another poster said. 99% of stuff from China (and a lot of the stuff local too) is cheap, low capacity memory hacked to appear to be 16GB and often enough they even include viruses on the damn things too!
UK buyers - Play.com are doing Class2 16GB's for £28 delivered (+Quidco cashback, www.quidco.com)

Jackuuuuu said:
Anyone know any reputable sites??? I'm in Australia... So hard to find one to ship Australia and cheap!
I'm after the Kingston 16GB Class 10 card!!!
Click to expand...
Click to collapse
the only place in oz i could find a 16gb card for my hd2 was vodafone. it wasn't cheap ($89aud) but i've not had any issues with it. it says it's a class 2. i'm sure i read here on the forum that the class really isn't an issue with the hd2 anyway.

Jackuuuuu said:
Anyone know any reputable sites??? I'm in Australia... So hard to find one to ship Australia and cheap!
I'm after the Kingston 16GB Class 10 card!!!
Click to expand...
Click to collapse
Umart sell the Kingston 16GB Class 2 Micro SD for $55. Unfortunately it's the only one they sell (no class 6 available on the website). Have purchased several times from them with no issues.

I did not even know there was a difference in classes. Glad I read this thread.

Class 10 SD cards
Anything over class 2 (which means it can read at a minimum or 2Mb sec) will be a waste of money on a mobile phone. Class 4 and up to the latest class 10, are designed for the speed needed on high end digital cameras that shoot HD videos.
Save your money, buy a good quality, genuine class 2 card, you will not see any difference on an HD2 with a class 10 card in it.

Some users reported that after changing their bundled class 2 card with class 6, music, album etc are up to 3 times faster in loading.
I just ordered a class 6 card to change it with mine class 2, will report about it.

Class
Im using the 16 gb kingston class 2 and it works like a sharm... if you are really picky you can go with a higher class card but be prepared to add some extra cash for a tiny bit of quicker preformance
Just so you will understand how the cards are built there is not much diference amongst the classes. This cards all have 16 Gb space whitch cover the tiny sd card. the diference is that on the higher class cards, the bytes will be shared out in a much more constructive way so it makes it easyer for the phone to read the data. we talk up to 2 seconds faster from the lowest class card to the highest class card. I belive thats from class 2 to class 6.
Good luck with your choice

MicroSDHC 32GB C2 or 16GB C10?

I was thinking about upgrading from my current Sandisk 16GB c2. As many of you know Sandisk is out with there 32GB c2 MicroSDHC which is selling for $100 by Verizon. But if you look on ebay you can also find other 32gb c2/c4 MicroSDHC from TopRAM and Centon. Now I personally have never heard any of these company so I am very spectacle.
Now my question is which would you go with 32GB c2 or 16GB class c6/c10? To me its storage vs transfer rate.
1) Sandisk 32GB MicroSDHC Class 2 = $100
2) Kingston 16GB MicroSDHC Class 10 = $135

Clearly you should really been far 16GB storage even as decided to use even go want to do look more like 32GB transfer rate?

FYI 16gb class 10 Kingston is $98.99 over @ newegg and if you look hard enough u can find it around $79

I am not sure what you are saying but some claims that the Sandisk 32GB C2 they get around 5mb/s write. So IDK ATM as Kingston 32GB Class 6 is selling for $700 on ebay WTF? Last time I check they didn't even have 32GB class 2, could be fake who knows.

sti-06 said:
FYI 16gb class 10 Kingston is $98.99 over @ newegg and if you look hard enough u can find it around $79
Click to expand...
Click to collapse
I am aware of that as they been had it for sometimes now but I was more leading to 32GB but who knows if I do decide to go with 16GB I might go with C10 from Kingston.
But has anyone tried TopRAM 32GB Class 4 or Centon 32GB Class 4? If so is it thoughly tested via R/W IOPs and fully chunking the card.

HyperNode said:
I am aware of that as they been had it for sometimes now but I was more leading to 32GB but who knows if I do decide to go with 16GB I might go with C10 from Kingston.
But has anyone tried TopRAM 32GB Class 4 or Centon 32GB Class 4? If so is it thoughly tested via R/W IOPs and fully chunking the card.
Click to expand...
Click to collapse
You cant go wrong with ScanDisk
its a safe bet

ilordvader could you test the R/W speed of your card and post back.

So after searching and reading many threads in various forums I came to the conclusion that even class 6 is an overkill so class 10 is out of the question other than bragging rights.
Now has anyone used Transcend or A-Data? they seem to be selling at Newegg so they can't be questionable unknown like TopRAM or Centon which I never even heard of until I was searching for MicroSDHC.
Anyone recommend any 16GB class 6 cards? I am still unsure on not ordering SanDisk 32GB Class 2 as storage is high but the speed is low. As majority of user who running Android port do recommend getting anything over class 2.

Extreme candidates:
Sandisk 32GB MicroSDHC Class 2 - $100 < Storage
Kingston 16GB MicroSDHC Class 10 - $135 < Speed
Are these the only reputable 16GB Class 6 candidates?
A-Data 16GB Class 6 - $53.99
Transcend 16GB Class 6 - $62.99
Lexar 16GB Class 6 - $69.99 < Questionable; produce inferior products
Has anyone heard of these company before?
Centon 16GB Class 6 - $58.99 < Questionable; but listed under Newegg
3C_Pro 16GB Class 6 - $44.99
TOPRAM 16GB Class 6 - $44.99
Team 16GB Class 6 - $44.99

i bought this. Komputerbay 32GB MicroSD SDHC Microsdhc Class 6. £88, which was preety steep.
i get read speads of around 3.5 mb/s and write speeds of 4.5 mb/s, i cant find my 2 speed to compare but it does seem quicker.
though the web site gaurantees minimum 6 mb/s write speeds.
it was amazon so i though it would be ok.
edit.
just tested it again i am getting 6 mb/s read speeds now.

johnwalk did you thoroughly test the card? by formatting and filling it up fully with chunks? if you can confirm its overall performance then I might also order it. Can't wait for other vendors to make it as I need it now. On class 2 card it takes like 30min to just move around 4.5gb now that's way to long for me as I'm always on the go, but thanks for your reply as ill look in to that company.

I don't want to spoil anything, but my HD2 just destroyed my 8GB Sandisk card. 'Luckily' this was not a $100 card, but still.......
Are you shure you want to spent that much, or did you never have your previous card(s) being destroyed?
Wish you goodluck anyway

i just formated it normally the filled it up with music and video still got two gigs left im like a dog with two tails i dont know what to listen to first lol. but the tests i done with it was when it was 28 gigs full only had it two weeks and at first it was slow, especially when you went into the music player it took a few seconds to update but hey a lot of files to browse but its been ok the past few days, but im now at the stage where i dont plug it into my computer anyway i just access my pc and transfer albums by wifi takes about a minute an album, any video usually gets streamed anyway, but wanted a bigger selection when i go on holiday next month.
def recomend this card thougth the first few days i thought i should have gone for the class two, im now happy with it now it all working properly.

I'm at work now and in an hour when I go home ill thoroughly look in to this card and post my finding. As I never even have heard of the company and if I like it ill post feedback here so others can buy it with confidence.
Far as flr goes how did HD2 destroy your card? corrupted the data? or the flash device is unreadable fully? BTW I never needed an flash card before as this is my first smartphone. Also I was welling to spend $750 few months before HD2 was officially deployed in USA. So I'm not worried about $100.
PS: Also have an eye on HD3 as the spec is 90% accurate from my guess after looking at the specs. So let's see what happens as I don't want a device which may have 2 versions, hence EU-Leo512 and EU-Leo1024.

off topic but im seriously looking into the new batch of android tablets which are just coming out now, maybe 7" or 10"

HyperNode said:
I'm at work now and in an hour when I go home ill thoroughly look in to this card and post my finding. As I never even have heard of the company and if I like it ill post feedback here so others can buy it with confidence.
Far as flr goes how did HD2 destroy your card? corrupted the data? or the flash device is unreadable fully? BTW I never needed an flash card before as this is my first smartphone. Also I was welling to spend $750 few months before HD2 was officially deployed in USA. So I'm not worried about $100.
PS: Also have an eye on HD3 as the spec is 90% accurate from my guess after looking at the specs. So let's see what happens as I don't want a device which may have 2 versions, hence EU-Leo512 and EU-Leo1024.
Click to expand...
Click to collapse
Hope the HD3 is for Att this time

I've got up to 14.7 MB/sec on my 16GB Kingston Class 10.. and my phone works soo smooth now!
Compared android sliding of homepage on my 2GB Class 2 card and my 16GB Class 10 card, and there is some lag with the 2GB card, and none at all (100% realtime) with the 16GB card..
So, personally I'd say; save some exrtra bucks and go for the 16GB Class 10 Kingston one!

@HyperNode
There are several threads here regarding SD cards being destroyed, or whatever description is given to it.
From one moment to another you get the message that you're card has to be formatted. If you accept it, it says something like (only) 30 MB being available, which doesn't get formatted. Your card can no longer be seen by your HD2, nor by your PC or any other cardreader (afaik)
I´ve never had this problem before. It looks like a specific HD2 problem.
Either with or without a combination to a specific brand or card.
I'm very curious about your experiences.
Please keep us updated.
Thanks and goodluck!

Same here. Mythen hd 2 just destroyed my SD card des SYstem ago
It happened already bevor, Thatcher i couldn't See Thema data anymore , but nie i Cantel even Format it anymore
Sent from my HTC Desire using Tapatalk

HD2 Memory 32G $99 CLASS 4!

Kingston 32GB Micro SDHC Flash Card with MicroSD Reader Gen 2 Model MRG2+SDC4/32GB
Average Rating 5 out of 5 eggs5/5(1 reviews)
In stock.
Now: $99.99
*
Free Shipping (restrictions apply)
Additional fees may apply to shipments to AK, HI and PR.
At New Egg!

This is worth it, take it from someone who was looking for something other than SanDisk 32GB C2 I have been waiting for Kingston's 32GB C4 for long time and when it came out I got it though offical site for $159.

Yeah, I ordered one of these last week from newegg along with an otterbox defender case for $33 w/free shipping for both.... not too bad at all. Should be getting them today. Has anyone used the Kingston class 4 32gb card for running android on the hd2?
Sent from my HTC HD2 using XDA App

Well, far as I know people do claim the R/W IOPs for HD2 when card inside the device won't go beyond class 2 rate but some who did use class 4-6 cards said they did see major improvement in terms of loading OS/Apps from mSD card. Anything beyond class 4 is an overkill on HD2 that I accept unless you are moving around massive amount of data and use HD2 as your mean to transfer it, in that case just buy thumb drive.
"Sent from my PC using THE hand" lol

I was in a Fry's Electronics the other day and I saw a 16gb Class 10 microsd card for $32.00. Don't remember the maker but it was not name brand, that is extremely questionable

wow
my videos which are about 12g play almost instantly now i love this card and the free usb reader, thanks kingston

Ya this card was worth waiting for hell I shot up an storm in this section comparing other vendors. Now I have the SanDisk 16GB C2 card not sure what to do with it, hopefully I can sell that cheap.

same
stuck with the sandisk

I ordered this 32GB class 4 card from Kingston and it is much slower then my old SanDisk card. Booting Android took over 5 minutes and after that the device still is VERY slow.
With its card reader I could copy my files onto it with 3-4MB/s.
Then I installed SKTools under Windows Mobile and used its benchmark tool to compare my SD Cards:
My old SanDisk 8GB card (stock one from the blackstone, afaik class 2): ~6,6MB/s reading and 1,1-1,5MB/s writing
The new class 4 32GB Kingston card: ~2,2MB/s reading and 500-700KB/s writing
So I can't use Android with this crappy SD card.

Ya IDK man same on my end. Took me 25min to traf 320mb files, ATM showing me 116min to traf 4.1gb.

i got kingston 23gb class 4. really disappointed takes forever to transfer. but speed test shows its class 4.
http://forum.xda-developers.com/showthread.php?t=861232
oh yeah i got the one from frys it rocks to bad its not 32gb.

I would stick with SanDisk.
I wanned to try out a faster card so got a class 6 Kingston 8gb.. while it loaded things faster, it caused severe stuttering and lagginess at times.
Upon reserach i found, kingston, and many other cards are not the same quality grade as sandisk, i am told in order to be price competitive they buy crap from others at cheap and stick thier name in it. And sometimes they buy rejects from sandisk, toshiba, samsung etc and brand them.....
Unfortunately i cant remmeber the links i researched....
So i would stick with sandisk, or another proven manufacturer....

UThis is total BS, I started it at like 6PM and now its 10:40PM and still 78min's to go WTF and its just 4.2GB music files avg at like 3-6mb/ea. Now I remember putting the whole dir in SanDisk 16GB Class 2 in less than 40min. So WTF does it take so long? Also as I wrote to Kingston CS ill share it here.
To make the file transfer go faster you have to directly allocate the file in memory thus saving time for R/W IO access. I did test many times but I am not even sure HD2 is following SD 2.0 or is it just this POS card no were close to even the stock SanDisk's.
Test: Dir with 5 files at 5mb/ea so thats 25mb. If you copy each file you reduce the time by 3x but if you copy the dir all the objects inside takes time to allocate for some reason.
PS: I am thinking about now getting SanDisk 32GB Class 2.
***UPDATE***
3.85GB
Write
--------
SanDisk 16GB Class 2 = 26min
Kingston 32GB Class 4 = 191min

HyperNode said:
Ya IDK man same on my end. Took me 25min to traf 320mb files, ATM showing me 116min to traf 4.1gb.
Click to expand...
Click to collapse
I also don't understand this.. I have a 16gb C2 card and wanted to experiment a lot with the various android roms out there, so thought a C4 would be the answer. ordered a 16gb C4 and it is always slower than the C2. a full 30 seconds on booting Android.
This confuses me.....okay okay .. thats not hard to do, but as far as I'm concerned if a card is rated at twice the "constant" speed of the other .. it should be faster...
<fx: scratches head and moves on>

HyperNode said:
Well, far as I know people do claim the R/W IOPs for HD2 when card inside the device won't go beyond class 2 rate but some who did use class 4-6 cards said they did see major improvement in terms of loading OS/Apps from mSD card. Anything beyond class 4 is an overkill on HD2 that I accept unless you are moving around massive amount of data and use HD2 as your mean to transfer it, in that case just buy thumb drive.
"Sent from my PC using THE hand" lol
Click to expand...
Click to collapse
I think it really depends on the card and not the class. I have a couple of Class4 and Class6 cards with identical builds of android and my class2 16gb continually outperform them in boot times and general speed. Class only designates write speed and there is a lot more to an SD card's performance that is not captured in the class designation.

ATM I am thinking about returning the Kingston 32GB C4 as I spoke to Kingston Tech Support and might go with SanDisk 32GB C2. Alot of people say SanDisk is superior and is faster for some reason and getting close to class 4 rating.

HyperNode said:
ATM I am thinking about returning the Kingston 32GB C4 as I spoke to Kingston Tech Support and might go with SanDisk 32GB C2. Alot of people say SanDisk is superior and is faster for some reason and getting close to class 4 rating.
Click to expand...
Click to collapse
I can only quote my experience and that is that kingston C4 is NOT fast at all.
Good luck to you.. and if you find the San Disk C4 is sooo much faster than the C2 can you report back please .. ?? So I can go get one

I just bought a kingston 32gb class 6 micro sdhc but when ever i put it in my hd2 it just freezes up and as soon as I remove the card it works fine again.At first i thought that it was a fake so I:
1)performed multiple tests,
2)reformated a 1000 times,
3)even putting 20gb of data just to make sure.
Turns out that it is authentic and it works perfectly on my girlfriend's htc BalckStone it also worked when I installed NAND (which i later removed due to insufficient memory).Ive been searching for days, I think its a windows mobile issue, any tips??

gothikserpent said:
I just bought a kingston 32gb class 6 micro sdhc but when ever i put it in my hd2 it just freezes up and as soon as I remove the card it works fine again.At first i thought that it was a fake so I:
1)performed multiple tests,
2)reformated a 1000 times,
3)even putting 20gb of data just to make sure.
Turns out that it is authentic and it works perfectly on my girlfriend's htc BalckStone it also worked when I installed NAND (which i later removed due to insufficient memory).Ive been searching for days, I think its a windows mobile issue, any tips??
Click to expand...
Click to collapse
LOL you are way to funny man as you said "I just bought a kingston 32gb class 6 micro sdhc" and then on top of that "Turns out that it is authentic".
I am guessing you got this card from eBay? If thats the case then its fake ill tell you why as there is no Kingston 32GB Class 6 card ATM. My best bet is you do extended data testing on it and verify the content to make sure its not corrupted. But if I was you I wouldn't do any of this as ill return that POS, why take chance with your data? Also NEVER buy memory cards via eBay or else you will be pwned with notorious chinese fakes.
But for those who actually thinking about buying the legit Kingston 32GB Class 4 microSD read below and think twice.
STHNS said:
Here this might be helpful to you.
Code:
df /dev/mnt/sdcard
File system: FAT32 (0x0c)
Used space: 16.0 KB (16,384 bytes)
Free space: 29.8 GB (32,073,891,840 bytes)
The data below is the actual IOPs from System (USB: Standard-A) to Device (USB: Micro-B) via USB (USB 2.0/SD 2.0). I am not using any type of card reader for this test as we only want the actual data rate of the card itself natively while its mounted in the device.
Subject: Kingston 32GB Class 4 (4MB/s) microSDHC.
Sequential Test Data (Block Size = 1024KB|0 Fill = 0x00)
Read [MB/s]: 13.07+11.72+13.11=37.9/3=12.63
Write [MB/s]: 4.080+3.339+1.592=9.011/3=3.00
Sequential Test Data (Block Size = 1024KB|1 Fill = 0xFF)
Read [MB/s]: 13.07+13.10+11.61=37.78/3=12.59
Write [MB/s]: 3.659+2.618+3.607=9.884/3=3.30
Mode: Low level R+W+V initialization
Data volume: 30588MBytes
Patterns: 18 sets, 8 of "walking one", 8 of "walking zero", 55h, AAh
Writing speed [03:24:28]: 2.49 MByte/s
Reading speed [00:44:20]: 11.5 MByte/s
Burst write: 4.0+4.0+4.0=4.0 MB/s
Burst read: 10.0+9.0+9.0=9.33 MB/s
Click to expand...
Click to collapse

It's class 4 but it's very expensive.. too much money for just a SD card

32gb class 2 vs class 4

Hey guys,
I'm interested in getting a 32gb card. I will be watching movies off it and just basically reading books. Is there a huge diff between the two? I googled and I found the diff write and read speeds but my question is how relevant is it to the user? Like will the movies be choppier or books open slower? etc

Julian2103 said:
Hey guys,
I'm interested in getting a 32gb card. I will be watching movies off it and just basically reading books. Is there a huge diff between the two? I googled and I found the diff write and read speeds but my question is how relevant is it to the user? Like will the movies be choppier or books open slower? etc
Click to expand...
Click to collapse
Sadly, to throw a wrench in your question, there is authority behind the class markings. Basically, there is nothing stoping makers for marking a card Class 10, even when it can barely do 1MB/s writes. So, how does that answer your question?
It comes down to brand. Sandisk by far makes the best microSD cards, which almost always outperform their rating. I have an 8Gb Class 2, that constantly benches at 5MB/s sustained write, and 12MB/s sustained read. I also have an 8GB Kingston clas4, that can barely hold 2MB/s write, if it is lucky. The other issue few talk about is random reads, where again, the Sandisk is much faster (and random reads are not part of the class specifications)..
So, if you get a decent brand (again, Sandisk), a class 2 should be suitable for all music, and most movies. If you can afford it, class 4 will give you wiggle room.

How about adata? Have you had any experience with them?

Julian2103 said:
How about adata? Have you had any experience with them?
Click to expand...
Click to collapse
personal experience no, but i haven't heard alot bad (actually, better than Kingston in many cases). I know they have decent prices on their cards.
With what i was saying before, it is fair to mention that while slow, my Kingston does still work. But saving things to it was painful, and so i avoid its use. Even if you don't get the fastest card, i think the biggest pain will be filling it once.. after that, using it should be ok..

I see. What about the performance? Saving stuff to it isnt much of an issue to me I think. Im more concerned on the performance. Like running movies off it and launching programs etc the sandisk sounds awesome but the price is much higher

For the use you are planning(movies) the big factor will be sequential read speeds. The class system is too easy for the manufacturers to game. Check the specs for the card you are looking at...if they don't tell you, it's likely because they suck. Sandisk class 2 cards are, as stated, usually better than the class 2 they are rated.

so you guys would recommend a class 2 32gb sandisk over a class 4 adata card of the same size yeah?

Can't really say one way or the other. From reading reviews at Newegg...seems like Adata tech support might be a bit iffy...then again those reviews are usually posted by those who have issues or feel like they have to defend their purchase(ie...fanboi's).
One thing I can see for myself...Adata is the only manufacturer on Newegg to actually list their full specs. Even on the manufacturers pages...only Adata has manned up and posted specs. otherwise they all just fall back on the SDHC specifications for class...which as stated can be gamed a bit.
At the end of it all..it's your cash...spend it the way you feel like...do some research for yourself first.

I have a scandisk class 4 32GB and it is way slower then a smaller class 6 that I have. For me, I don't think I could stomach anything slower then the class 4 for large files.

Divine_Madcat said:
Sadly, to throw a wrench in your question, there is authority behind the class markings. Basically, there is nothing stoping makers for marking a card Class 10, even when it can barely do 1MB/s writes. So, how does that answer your question?
It comes down to brand. Sandisk by far makes the best microSD cards, which almost always outperform their rating. I have an 8Gb Class 2, that constantly benches at 5MB/s sustained write, and 12MB/s sustained read. I also have an 8GB Kingston clas4, that can barely hold 2MB/s write, if it is lucky. The other issue few talk about is random reads, where again, the Sandisk is much faster (and random reads are not part of the class specifications)..
So, if you get a decent brand (again, Sandisk), a class 2 should be suitable for all music, and most movies. If you can afford it, class 4 will give you wiggle room.
Click to expand...
Click to collapse
Sandisk is great. I was originally running Nookie Froyo from a class 2 Sandisk. It was actually pretty solid. I moved up to a Transcend class 6 and it's been good too. Both seem to perform well over their class specification when I'm transferring files and have been very stable.
On the other hand, my friend has a Kingston class 10 which seems pretty buggy. A lot of force close errors, looping boots, etc. Though these could just be a coincidence. Haven't seen him transfer any files though, so I can't judge the speed.

SD Cards..
You should be aware that Sandisk, Adata and others do not actually manufacture flash memory chips, they mostly package and test it - the big boys in the game are Intel, Samsung, Toshiba and Hynix. Depending on where or from whom Sandisk buys the basic chip the specs may be different.

Divine_Madcat said:
Sadly, to throw a wrench in your question, there is authority behind the class markings. Basically, there is nothing stoping makers for marking a card Class 10, even when it can barely do 1MB/s writes. So, how does that answer your question?
Click to expand...
Click to collapse
Actually there is a requirement if you're in the SD Association. But in reality anyone can stamp a C10 on a card, especially no-name brands.
Julian2103 said:
so you guys would recommend a class 2 32gb sandisk over a class 4 adata card of the same size yeah?
Click to expand...
Click to collapse
Absolutely. AData are junk in my experience.
Kingston and SanDisc are the only ones that are reliable for all devices that I've owned. Others are hit and miss, PARTICULARLY Patriot. I've had 3 Patriot cards that were JUNK in most devices. I had two Patriot SD cards for a camera that were fine but couldn't work right in anything else, and I (stupidly) purchased an 8G uSD card a few years ago for a phone and it was junk there, and I've periodically tried it in new devices for giggles and it's been junk in every single one.
I'll bet a SanDisc C4 out classes any other brand C10 in device like a phone or tablet.
Side note: All 3 Patriot's work just fine on my computer. I did tests particuarlly on the 8G uSD over and over and over and it was fast and reliable in my card reader. Every device locks up or goes slow as hell if it's in 'em. My guess is that they didn't follow specs closely.

So a Sandisk Class 4, 8GB would be a good pick?

I Am Marino said:
So a Sandisk Class 4, 8GB would be a good pick?
Click to expand...
Click to collapse
I recently bought this on and have found it to be an excellent performer. Loading/watching mp4 movies. The 30 day return window is pretty generous.
http://cgi.ebay.com/Sandisk-32GB-Mi...352023?pt=PDA_Accessories&hash=item2eb43c6317

SD cards are a complicated topic... not to throw another wrench into the system but you also want to be careful WHERE you buy your card. SanDisk counterfeiting is RAMPANT since a vendor can take a blank card, less than a pennies worth of ink and then charge you some percentage of the SanDisk price while still reaping a huge profit. As unfortunate as it is, real SanDisk cards always seem to just work while the other cheaper cards can be hit or miss. Honestly though the only real problem with off brand cards and the NC I have had is that they don't always boot so good. So I use my SanDisk 8GB C2 (bought from Costco) to boot and my Patriot 16GB C10 to watch movies and store stuff. Buying from Retail, Newegg, or Amazon (Amazon itself, not a sold through vendor on Amazon) should help make sure whatever you buy is the real thing. Good Luck!

[Q] I'm buying a Nook, what else do i need?

I'm buying a nook color as a quick entry into the world of tablets. I plan on using it for reading on the bus etc. But I'm also interested in rooting so I can customize it as well. So I'm planning to dual boot CM7 from the SD card but leave it stock otherwise. With that in mind, what do I need to purchase as a first time Nook buyer interested in modding?
Here's my list:
- Nook Color (of course)
- Aegis Series Enclosure System
- rooCASE (would the nook fit in cases like these with the body armor on?)
- Transcend 8 GB microSDHC Class 6 (read that the class is important when modifying)
- Kingston Flash Memory Reader (to read/write to the SD card)

if your flashing to the emmc class isnt as important, ive been using a plain old class 2 from wallyworld for about a month with no issues.

I have a Sandisk 8GB class 2 form walmart which works fine since I installed the ROM on EMMC.

The speed of the memory card can be a factor with things like video playback, transferring data too and from, etc. Honestly, I would recommend just getting a class 10. The price difference is so nominal that you may as well get something with a little speed. Also, a 16gb isn't much more than an 8gb. So my recommendation...16gb class 10. Something I'm picking up today myself to replace my 8gb class 6 card.
16GB Class 10 for $27.99
16GB Class 6 for $29.99
8GB Class 10 for $19.75
8GB Class 6 for $15.50

I thought about that, but the reviews for larger cards weren't that good so I suck with the 8GB.
The bigger issue is, should I buy it now or wait for B&N announcement later this month?

1) The announcement from B&N about a new Nook on the 24th didn't mention if it was color or not; personally, I'm betting on an update to the original, since the color's only been out for 6 months.
2) Please please *PLEASE* heed my advice on this - if you're planning on running off the μSD card, do NOT buy a class 6 or class 10 card unless you've seen small-block write speed benchmarks. Card Class refers to large-block, sequential R/W speeds, which is good when you're transferring big files on and off of the card, but doesn't factor in quick access or small R/W like you need when you're running an OS from it. I bought a Kingston 8GB class 6 the same day as my NC, 10 days ago, and I almost got to the point of wanting to return the device because of how disappointed I was in it. Then I found this thread -
http://forum.xda-developers.com/showthread.php?t=1005633
and learned about the various card speed tests. I switched to a Sandisk 16GB class 4, and it was like a whole new device. I couldn't be happier with it now.
So, yeah, this is seriously important - read through that thread. And if you live near a RadioShack, they're running a 50% off sale on the good Sandisk cards for the rest of the week.

chinly43 said:
2) Please please *PLEASE* heed my advice on this - if you're planning on running off the μSD card, do NOT buy a class 6 or class 10 card unless you've seen small-block write speed benchmarks. Card Class refers to large-block, sequential R/W speeds, which is good when you're transferring big files on and off of the card, but doesn't factor in quick access or small R/W like you need when you're running an OS from it. I bought a Kingston 8GB class 6 the same day as my NC, 10 days ago, and I almost got to the point of wanting to return the device because of how disappointed I was in it. Then I found this thread -
http://forum.xda-developers.com/showthread.php?t=1005633
and learned about the various card speed tests. I switched to a Sandisk 16GB class 4, and it was like a whole new device. I couldn't be happier with it now.
Click to expand...
Click to collapse
Strongly agree with this. I got the Transcend C6/8Gb, and had a huge amount of problems (forced closes, and erratic launcher behavior) when running cm7 off of the SD that have completely disappeared since switching to the Sandisk C4/8GB on sale at the Shack. Some radioshacks seem to carry the C2 cards, and some the C4 cards. They are the same price, so it might be worth checking out a few stores if there are several in your area.
If you are just using this as a normal SD card and will be running CM7, froyo, nooter, whatever off of the emmc, then the Transcend is perfectly fine.

hoteladriano said:
Strongly agree with this. I got the Transcend C6/8Gb, and had a huge amount of problems (forced closes, and erratic launcher behavior) when running cm7 off of the SD that have completely disappeared since switching to the Sandisk C4/8GB on sale at the Shack. Some radioshacks seem to carry the C2 cards, and some the C4 cards. They are the same price, so it might be worth checking out a few stores if there are several in your area.
If you are just using this as a normal SD card and will be running CM7, froyo, nooter, whatever off of the emmc, then the Transcend is perfectly fine.
Click to expand...
Click to collapse
Also strongly agree about SD cards. I just bought NC, used a PNY 4gb class 4 to boot off CM7 and it worked but not well, just like hoteladriano - forced closes, erratic behavoir. Will try again with the recommended Sandisks.

I've been using a Patriot 8GB class 10 for a month or so without any problems. Must have gotten lucky. Bought mine at Newegg after being told that a lot of the SD cards at Amazon are fakes, for whatever that's worth.

I"m using a 16 gig class 2 with no issues

I'm using a C6 8 GB Transcend. Saw lots of people rave about them. I'm running the Phiremod/Honeycomb dualboot and see pretty good success with it. Certain apps don't work right and cause force closes (Android Comic Viewer, Pulse) and once those crash I need to reboot to get everything work again. Other than that, its worked fine for me.
That being said, I would agree with everyone here that the Sandisk is your best bet. I may run out to radioshack tomorrow to grab myself another card, just to see how improved my experience would be!

chinly43 said:
1) The announcement from B&N about a new Nook on the 24th didn't mention if it was color or not; personally, I'm betting on an update to the original, since the color's only been out for 6 months.
2) Please please *PLEASE* heed my advice on this - if you're planning on running off the μSD card, do NOT buy a class 6 or class 10 card unless you've seen small-block write speed benchmarks. Card Class refers to large-block, sequential R/W speeds, which is good when you're transferring big files on and off of the card, but doesn't factor in quick access or small R/W like you need when you're running an OS from it. I bought a Kingston 8GB class 6 the same day as my NC, 10 days ago, and I almost got to the point of wanting to return the device because of how disappointed I was in it. Then I found this thread -
http://forum.xda-developers.com/showthread.php?t=1005633
and learned about the various card speed tests. I switched to a Sandisk 16GB class 4, and it was like a whole new device. I couldn't be happier with it now.
So, yeah, this is seriously important - read through that thread. And if you live near a RadioShack, they're running a 50% off sale on the good Sandisk cards for the rest of the week.
Click to expand...
Click to collapse
After reading what you suggested and hearing from others I think I'll take your advice. Question is, is it the lower the class the better the performance when running an OS? I'm look at a SanDisk 16 GB Class 2. What do you think?

If I recall, from everything I've read a class 2 Sandisk should be okay, but a class 4 Sandisk would be ideal. If you try radioshack, look through the cards to find a class 4 one. They're not very careful, so they mix the class 2 and class 4 together.

rnp614 said:
I"m using a 16 gig class 2 with no issues
Click to expand...
Click to collapse
This.
I have a 16gb Sansisk uSD class 2 and everything is good. No FC with apps installed on uSD. I don't store movies on it because I can stream it with CifsManagers and MoboPlayer. I recommend 16gb over 8gb. A lot of games required extra downloads which can range up to 100MB+. Backups can take up space as well.

Midgets... and lots of them
Sent from my HTC Vision using XDA App

For_the_moves said:
Question is, is it the lower the class the better the performance when running an OS?
Click to expand...
Click to collapse
That ends up really generally being true, because the small-block write speed is precisely what's sacrificed to get better large-block speed, but things can vary so much that I'd stick with either something that's been tested or something from a store with a good return policy.
Without extra details or benchmarks, I would buy a class 2 before I bought a 6 or 10.

ebubar said:
I'm using a C6 8 GB Transcend. Saw lots of people rave about them. I'm running the Phiremod/Honeycomb dualboot and see pretty good success with it. Certain apps don't work right and cause force closes (Android Comic Viewer, Pulse) and once those crash I need to reboot to get everything work again. Other than that, its worked fine for me.
That being said, I would agree with everyone here that the Sandisk is your best bet. I may run out to radioshack tomorrow to grab myself another card, just to see how improved my experience would be!
Click to expand...
Click to collapse
I'll love to hear your experience with the new card once you test it.

Yeah, this thread schooled me. I bought a Patriot class 10 card 16gb and OMFG the speed was dismal. It's going back and I think I'm going to order a cheaper Sandisk class 2 for close to half the cost.

For_the_moves said:
After reading what you suggested and hearing from others I think I'll take your advice. Question is, is it the lower the class the better the performance when running an OS? I'm look at a SanDisk 16 GB Class 2. What do you think?
Click to expand...
Click to collapse
Read the linked thread and you'll learn all you need to know. It's the small-block random writes that are important for running an OS, and while it's generally poor in higher-class cards, it varies considerably between models at the class 2/4 level. Also, be sure you're not buying from Joe Blow in Beijing--there are a lot of counterfeit cards out there.

For_the_moves said:
I'm buying a nook color as a quick entry into the world of tablets. I plan on using it for reading on the bus etc. But I'm also interested in rooting so I can customize it as well. So I'm planning to dual boot CM7 from the SD card but leave it stock otherwise. With that in mind, what do I need to purchase as a first time Nook buyer interested in modding?
Here's my list:
- Nook Color (of course)
- Aegis Series Enclosure System
- rooCASE (would the nook fit in cases like these with the body armor on?)
- Transcend 8 GB microSDHC Class 6 (read that the class is important when modifying)
- Kingston Flash Memory Reader (to read/write to the SD card)
Click to expand...
Click to collapse
I have the Aegis case for Nook Color, and it's awesome. I've never taken mine off as you have access to all ports including the SD slot, and I've heard that repeatedly taking it off and putting it on again stretches it out and results in a poorer fit. Unfortunately, I bought an Aalto case from B&N thinking it would fit with the Aegis still on, and it doesn't. I don't know about the rooCases, but I've been told that the Rocketfish "Case for Most eReaders" will fit the NC inside the Aegis case, and have ordered one from ebay for $6.99 after shipping.
It's been well covered in general, and you should read the SD card thread everyone's mentioning, but in particular, if you're booting from SD, buy a SanDisk card with a good general rep for fast random small-block writes, then benchmark it yourself with CrystalDiskMark before using it.