Database Develop

Class 10 micro sd?

Admittedly, I'm not 100% up to speed on flash memory tech, but I'm shopping for a new card, and ran into this:
Kingmax 8GB MicroSDHC Class 10
I thought that Class 6 was the highest. Anybody have any experience with one of these?

pendo said:
Admittedly, I'm not 100% up to speed on flash memory tech, but I'm shopping for a new card, and ran into this:
Kingmax 8GB MicroSDHC Class 10
I thought that Class 6 was the highest. Anybody have any experience with one of these?
Click to expand...
Click to collapse
News to me, not heard of class 10 before

Never heard of kingmax, no such thing as class 10

pendo said:
Admittedly, I'm not 100% up to speed on flash memory tech, but I'm shopping for a new card, and ran into this:
Kingmax 8GB MicroSDHC Class 10
I thought that Class 6 was the highest. Anybody have any experience with one of these?
Click to expand...
Click to collapse
I'm running a 16Gb Class 10 Kingston which is quick, but not heard of Kingmax tbh.

pinke123 said:
Never heard of kingmax, no such thing as class 10
Click to expand...
Click to collapse
Class 10

kingmax has always been pretty good at this.
i just got my class 6 16gb like a month ago, but i bet a class 10 16gb should cost heaps

In that amazon link it's like $30 for an 8 gb card. I might just have to order it and try it out....

pendo said:
In that amazon link it's like $30 for an 8 gb card. I might just have to order it and try it out....
Click to expand...
Click to collapse
just double triple check on it cuz Kingmax is pretty much the only ones out w/ them things. be safe.

yeah....not that I can afford to throw away money or anything, but I figure it's probably worth it to try.
It seems that the 8 gb cards are in a real sweet spot right now pricewise. It still amazes me when I look at these tiny chips and think about how much you can fit in there
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

pendo said:
yeah....not that I can afford to throw away money or anything, but I figure it's probably worth it to try.
\It still amazes me when I look at these tiny chips and think about how much you can fit in there
Click to expand...
Click to collapse
ur right. if uve gotta hide somethin from ur gf/wife stick it in a mini sd, bury it under ur pillow and we're all safe.

I also have a Kingston Class 10 card in mine, seems to work well, but I really have nothing to compare it to. Didn't check read and write speeds yet as I only recently got it.
Odd company, but the one review on Amazon looks decent, and for that cheap... that is either really good or it isn't going to be a Class 10 card. I guess you will find out but they certainly exist.

I got a Class 10 Kingston microSDHC with 16 GB. You notice the difference if you preview like 700 pictures or move big apps to SD. I cannot say if it is much faster than a Class 6, but I think it is definately worth it. Also, with 2.2 and 720p recording it might work better, but I had no time to test it yet.

http://en.wikipedia.org/wiki/Secure_Digital#Speed_Class_Rating
Speed Class Rating
The Speed Class Rating is the official unit of speed measurement for SD Cards, defined by the SD Association. It is equal to 8 Mbit/s, and it measures the minimum write speeds based on "the best fragmented state where no memory unit is occupied":[10]
The following are the ratings of some currently available cards:
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Even though the class ratings are defined by a governing body, like × speed ratings, class speed ratings are quoted by the manufacturers but unverified by any independent evaluation process. In applications that require sustained write throughput, such as video recording, the device may not perform satisfactorily if the SD card's class rating falls below a particular speed. For example, a camcorder that is designed to record to class 6 media may suffer dropouts or corrupted video on slower media.
Important differences between the Speed Class and the traditional CD-ROM drive speed measurement ("×" speed ratings) are that speed class:
1. may be queried by the host device
2. defines the minimum transfer speed.
Since the class rating is readable by devices, they can issue a warning to the user if the inserted card's reported rating falls below the application's minimum requirement.
On 21 May 2009, Panasonic announced new class 10 SDHC cards, claiming that this new class is "part of SD Card Specification Ver.3.0".[11] Toshiba also announced cards based on the new 3.0 spec[12]
On 01 Jun 2010, Pretec announced the new Class 16 HD video grade SDXC 64GB card at Computex Taipei 2010.[13]
[edit] × rating
The × rating is a unit of measurement equal to 1.2 Mbit/s. It is derived from the standard CD-ROM drive speed of 1.2 Mbit/s. Basic cards transfer data up to six times (6×) the data rate of the standard CD-ROM speed (7.2 Mbit/s vs 1.2 Mbit/s). The 2.0 specification defines speeds up to 200×, but unlike the class rating system, does not mandate that x-ratings measure the card's sustained write-speed. For most cards, the maximum read speed is typically faster than its maximum write speed, leading some manufacturers to use read-speed as the ×-rating measurement. Other vendors, such as Kingston, use write-speed.[14]
This table lists common ratings and minimum transfer rates.
Rating Write Speed
(Mbit/s) SD Class
6× 7.2
10× 12.0
13× 16.0 2
26× 32.0 4
32× 38.4 5
40× 48.0 6
66× 80.0 10
100× 120.0 15
133× 160.0 20
150× 180.0 22
200× 240.0 30
266× 320.0 40
300× 360.0 45
Click to expand...
Click to collapse

Can the Nexus One handle these speeds?

An fyi, the speed across the leash is capped so transfers dont go any faster unless you pull the sd card and plug it into the pc. I get a huge difference doing that with my class 10 but in the phone nothing over the stock sd whatever the hell that was.

Kingmax also make good rams, I used them back in the day on the IBM 600X.
If it's a real Kingmax then you are good to go.

I got that kingmax 8GB class 10. In my Windows 7 transfer (both to a usb reader and to the built in sd reader of the macbook pro), my transfer (write speed) is good but not 10MB/sec. It tops at around 8.5MB/sec and hovers at the 8MB/sec pretty much.
But then again my 8GB class 4 from PNY is going to around 6.5MB/sec lol....

[Q] MicroSD Selection Help - Nook Color

What MicroSDHC cards have any of you used successfully with the Nook Color? I intend to run Froyo off it until the Honeycomb ports become more stable.
I was considering the Patriot LX Class10 16GB from Newegg, but there is one review saying they had issues. Is this just a case of user error? Has anyone used this card successfully? Any suggestions on other quick cards with good capacity and decent pricing?
I assume this subject has already been covered, but my web searches only got me about 30 tabs open in Chrome and a lot of threads with vague answers that go off topic. If one isn't out there yet, a sticky thread for people to list specific cards they are using would be awesome.
I would appreciate any help.

I've used a Patriot Class 10 8 gig and a Kingston Class 4 4 gig successfully.
The Patriot tests out as a Class 10, significantly faster than the Kingston, yet both gave me UI response significantly choppier and frustrating compared to stock eclair (rooted). Both were similar.
And no, it wasn't the media server.
I put it down as standard using booting from an SD even though other people have commented on SD froyo being snappier. Maybe both cards suck for froyo.

SD card speeds
Here are my numbers:
Patriot 8 gig Class 10
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : Crystal Dew World
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 20.049 MB/s
Sequential Write : 13.894 MB/s
Random Read 512KB : 19.281 MB/s
Random Write 512KB : 1.687 MB/s
Random Read 4KB (QD=1) : 2.418 MB/s [ 590.2 IOPS]
Random Write 4KB (QD=1) : 0.014 MB/s [ 3.5 IOPS]
Random Read 4KB (QD=32) : 3.324 MB/s [ 811.6 IOPS]
Random Write 4KB (QD=32) : 0.034 MB/s [ 8.4 IOPS]
Test : 50 MB [N: 5.0% (5.8/115.8 MB)] (x5)
Date : 2011/03/01 20:25:41
OS : Windows XP Home Edition SP3 [5.1 Build 2600] (x86)
---------------------------------------------------------------------
Kingston Class 4 4 Gig
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : Crystal Dew World
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 18.700 MB/s
Sequential Write : 4.277 MB/s
Random Read 512KB : 17.269 MB/s
Random Write 512KB : 0.677 MB/s
Random Read 4KB (QD=1) : 2.011 MB/s [ 490.9 IOPS]
Random Write 4KB (QD=1) : 0.006 MB/s [ 1.5 IOPS]
Random Read 4KB (QD=32) : 2.088 MB/s [ 509.7 IOPS]
Random Write 4KB (QD=32) : 0.016 MB/s [ 3.9 IOPS]
Test : 50 MB [N: 0.0% (0.0/3750.0 MB)] (x5)
Date : 2011/03/01 19:39:27
OS : Windows XP Home Edition SP3 [5.1 Build 2600] (x86)

Thanks for the quick reply and the numbers. I would assume the Patriot Class 10 16GB would have similar performance to your 8GB.
I am starting to wonder if the stuttering you are getting is from the Class 4 having too slow writes and the Class 10 is causing errors from being too fast for the Nook's card reader, or general compatibility. Maybe a Class 6 would be a better fit.
Which Froyo ROM did you use?

I used both 0.6.7 (packaged and "raw") and 0.6.8. I struggled with them enough to get the Market running and somewhat decent wifi speeds (though not stellar) and then threw in the towel. When I get bored I'll probably give the eMMC version a shot to see if it's all that and a bag of chips like they say.
And that's an interesting theory. I've not seen any one propose that a card could be TOO fast for the nook. I'd say it's far-fetched but I admit that I'm not an EE.

hello, i am also a newbie with Nook Color and am planning to root my nook. i am also looking for recommendations on what micro sd to purchase to root.
Here's my specs:
Software: 1.1.0
Model : BNRV200
Serial Number : 2010*************

I found another post that tried to start a thread for cards that worked, but the discussion died out. However, it did list a good number of success/fail rates.
From computerpro3:
Known Good
16GB Class 4 Patriot - 5.9, 6.6, 6.7
8GB Class 6 Lexar - 6.6, 6.7
8GB Class 6 Wintec - 5.9 (untested 6.6 and 6.7)
4GB Class 2 MicroCenter brand - 5.9, 6.6, 6.7
4GB Class 6 Transcend - 5.9, 6.6, 6.7
4GB Class 6 Adata - 5.9 (untested 6.6 and 6.7)
2GB Class 4 Sandisk - 6.6, 6.7
Known Bad:
16GB Class 6 RiData - hangs on Android boot screen with 5.9, with 6.6 and 6.7 it boots but gets endless loops of force closes. Tried multiple cards, all brand new.
16GB Class 10 Patriot - same symptoms as above
16GB Class 10 Wintec - same symptoms as above
16GB Class 6 Transcend - same symptoms as above
16GB Class 10 Adata - same symptoms as above
Click to expand...
Click to collapse
It looks like the Nook just doesn't like 16GB cards for the most part, and I haven't found a completely positive review of a Class 10 card. Perhaps that is a Nook hardware issue (buffer overrun by too much data from card at once), flaws in card construction, or an issue with the ROM and specific cards.
I was going to go with a Patriot Class 10 something, but swoozle's stutter scared me, so I went with a cheap card to at least learn on. Wintec Class 6 8GB is on sale today from Newegg for $11 shipped. If it doesn't work, I can throw it into my photo frame. People seem to like it though. One review notes it having class 10 speed.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820161404
I plan on running eMMC once I get my card.
Swoozle, please let us know if the stutter goes away with eMMC on your cards.
Thanks again.

SD card speed?

i upgraded to a new SD card and run antutu to see how fast it is but to my surprise this new class 10 card is not faster than my old class 2 card.
so is there like a hardware limit or why could that be?
both cards have about
6mb/s write and
15mb/s read.
anyone got some better results with a class 10 card?
Sent from my Optimus 2X using XDA App

Some brands are faster than others even if they are from a lower class.
For example, my Sandisk class 2 is faster than a Kingston class 4.
Which brand is your card???
Cheers!

el_charlie said:
Some brands are faster than others even if they are from a lower class.
For example, my Sandisk class 2 is faster than a Kingston class 4.
Which brand is your card???
Cheers!
Click to expand...
Click to collapse
its a kingston class 10 vs sandisk class 2.
with a class 4 vs 2 i could underatand it but this is supposed to be a class 10 which should have about 10mb/s write speed according to wikipedia. that would almost be double the speed that i get...
Sent from my Optimus 2X using XDA App

Hi, with my 16GB Class 10 card I get these speeds;
Write 12.3 MB/s
Read 16.9 MB/s
My card is a no brand card I bought from eBay in March for £16.
http://www.ebay.co.uk/itm/16GB-CLAS...AsAccessories_MemoryCards&hash=item1c1f50b680
Anil

I have a Samsung Plus 16GB Class 10 and get:
According to SD Tools: 12.4MB/s write and 17.2 MB/s read.
According to AnTuTu: 11.3 MB/s write and 14.7 MB/s read.

16GB Sandisk Class 10 (Antutu 2.3.1, 2nd run.)
10.4 MB/s Read
10.0 MB/s Write
The card has 12.4 GB on it of real data before testing.
This is on GR3, which I don't think has any "SD-Card optimization". (Too lazy to check.)
Keep in mind that we don't know, at least I don't, how Antutu tests. If it's testing with a lot of independent reads/writes, the speed will invariably go down. (If copying a single large file from my computer, I get a much higher throughput.)
"Class 10" should only mean that your card is able to sustain 10MB/s of continuous writes, it doesn't say anything about access times/block erase speed (which can influence any benchmark.)

Hi TrymHansen, there is a free app called SD Tools which does nothing but test SD card speeds.
Edit:
FOR ANYBODY ELSE READING THIS THREAD:
The class rating of a card indicates the minimum speed the card will write at. Class 10 = 10 MB/s write speed. Read speeds are usually higher than write speeds.
Anil

Excuse me for being dense, but I don't get the point of your post. I explained in my post what Class 10 means, and then you post as if I asked what class 10 means.

TrymHansen said:
Excuse me for being dense, but I don't get the point of your post. I explained in my post what Class 10 means, and then you post as if I asked what class 10 means.
Click to expand...
Click to collapse
My post wasn't only for you. The first part about SD Tools pertains to you. And anyway your post is incorrect, the Class rating indicates the MINIMUM speed the card will write at. Which isn't the same as a sustained speed.
Anil

aksolanki said:
My post wasn't only for you. The first part about SD Tools pertains to you. And anyway your post is incorrect, the Class rating indicates the MINIMUM speed the card will write at. Which isn't the same as a sustained speed.
Anil
Click to expand...
Click to collapse
So even though Rusty already has measured his card with SD Tools:
Rusty! said:
I have a Samsung Plus 16GB Class 10 and get:
According to SD Tools: 12.4MB/s write and 17.2 MB/s read.
According to AnTuTu: 11.3 MB/s write and 14.7 MB/s read.
Click to expand...
Click to collapse
... you somehow assume I cannot possibly have read that, and strongly feel I should be singled out for a recommendation of an app EVERYBODY on XDA knows about. For that dedication I thank you.
My post is not incorrect. I'm saying exactly the same thing you did in the post following mine using different wording.
Anyway, I'm not about to start a flamewar with you. Thanks for the input, now lets go do something constructive.

TrymHansen said:
So even though Rusty already has measured his card with SD Tools:
... you somehow assume I cannot possibly have read that, and strongly feel I should be singled out for a recommendation of an app EVERYBODY on XDA knows about. For that dedication I thank you.
My post is not incorrect. I'm saying exactly the same thing you did in the post following mine using different wording.
Anyway, I'm not about to start a flamewar with you. Thanks for the input, now lets go do something constructive.
Click to expand...
Click to collapse
Hi TryHansen, I'm not sure why you are taking this personally. But I offer my apologies if I offended you.
Anil

thanks a lot for your feedbacks. so i will return this ****ty card, if it has only half of the specified speed i guess i have something to complain about....
Sent from my Optimus 2X using XDA App

grognaz said:
thanks a lot for your feedbacks. so i will return this ****ty card, if it has only half of the specified speed i guess i have something to complain about....
Sent from my Optimus 2X using XDA App
Click to expand...
Click to collapse
Hi grognaz, from your stated speeds it would seem you have a class 6 SD card. My card has no brand on it but it reads and writes at the speeds stated by the eBay seller.
Good luck. Anil

grognaz said:
thanks a lot for your feedbacks. so i will return this ****ty card, if it has only half of the specified speed i guess i have something to complain about....
Sent from my Optimus 2X using XDA App
Click to expand...
Click to collapse
I can confirm the quality of Kingston SD cards. My 16GB "Class 10" gets the following in SD Tools:
Writing Speed: 7.2MM/s
Reading Speed 13.5MB/s
It's good enough for me as I was considering just getting a Class 6 as I don't exactly do much HD video recording, but if you need the speed - avoid this card!

I am using Sandisk 32gb class 4 card.
Antutu Benchmark
SD card write: 5.6 MB/S
SD card read: 8.9 MB/s

Your SD Cache size matters when u perform SD Speed test in your phone. If you are using CM7 ROM, the default is a mere 128kb cache.
Cache size of SD can be from 128kb to 4096kb and different sd cards will perform better/worst with different cache sizes.
Just thought it would be a good info to share.

why is it that im getting two diff figures when i test my card with antutu and sd tools?
sd tools - read 33MBs
write 6.1MBs
antutu read 10MBs
write 2.6MBs
something doesnt add up
sd read is 2046 default on miui rom
my card is a ridata 8gb class 10
which figure could be correct?

temasek said:
Your SD Cache size matters when u perform SD Speed test in your phone. If you are using CM7 ROM, the default is a mere 128kb cache.
Cache size of SD can be from 128kb to 4096kb and different sd cards will perform better/worst with different cache sizes.
Just thought it would be a good info to share.
Click to expand...
Click to collapse
This is sort of true, but if it was a mere cache it would always be a good idea to set it as large as you can afford RAM-wize. This is not the case.
It is a read-ahead cache. In short that means that whenever a read is requested, it first checks the cache to see if the data is already there, if not it reads the amount of bytes specified no matter what.
Increasing the read-ahead cache will help when reading large files, since it leads to fewer (actual) io-commands being executed.
However, if you're reading a lot of small files it will hurt performance, since for every read issued it will read a lot of unnecessary data before it can go on to the next request.
(I also think this is at a block-level, which means that it merely reads the next blocks, not knowing if they actually belong to the file you're reading at the moment, but not sure about that.)

Hey guys..
Just format your sd cards to 32KB. This i did to my Optimus Black and saw big difference

yannisb99 said:
Hey guys..
Just format your sd cards to 32KB. This i did to my Optimus Black and saw big difference
Click to expand...
Click to collapse
If use 8G↓ , then set cluster to 32K.
If use 16G↑, then set cluster to 64K.
Test it!

Anyone tried a 64GB SD?

Apparently these new 64gb SDXC cards work in some, if not many SDHC devices that do not officially support SDXC. I'd love to put my whole mp3 collection (40gb) and still have room for a handful of movies.
Probably going to get one for my Bionic, but if I know it'll work on the Nook as well I'd get two right off the bat.

Null
---------------------------------
Sent from my LG Optimus V using Tapatalk

koopakid08 said:
It will not work. Nook like almost all phones only supports up to 32GB.
---------------------------------
Sent from my LG Optimus V using Tapatalk
Click to expand...
Click to collapse
It only documents compatability with up to 32 GB... but that does not mean it is not capable of using the 64... this has been common in "computer" technology... they will advertise compatability with the largest drive available at the time.. but along comes something bigger... sometimes it works... sometimes it don't.
Bottom line is... we won't know if the nook color can use the 64 GB sdxc until someone tries.
To the OP.... if I were you I'd try it in the nook first... if it works then you can get another (and let us know either way)... either way you can reformat it to work in your Bionic anyway.

Doesn't it depend on the number of address lines that the uProcessor has (or at least has enabled/available)? A look at the device specifications may actually tell for certain how much memory can be addressed by the NC.
DizzyDen said:
It only documents compatability with up to 32 GB... but that does not mean it is not capable of using the 64... this has been common in "computer" technology... they will advertise compatability with the largest drive available at the time.. but along comes something bigger... sometimes it works... sometimes it don't.
Bottom line is... we won't know if the nook color can use the 64 GB sdxc until someone tries.
To the OP.... if I were you I'd try it in the nook first... if it works then you can get another (and let us know either way)... either way you can reformat it to work in your Bionic anyway.
Click to expand...
Click to collapse

gsutton said:
Doesn't it depend on the number of address lines that the uProcessor has (or at least has enabled/available)? A look at the device specifications may actually tell for certain how much memory can be addressed by the NC.
Click to expand...
Click to collapse
The SD card is a block device, which means it's not directly addressable. It's not a matter of the number of address lines on the uProcessor. It's a matter of if the software driver can issue the correct commands to get to all the data since the bus interface hasn't changed. See here
Frank

http://www.google.com/url?sa=t&rct=...K6vI1q&usg=AFQjCNGFn-QDxzO3iGCh1RuqeplfGapGKw
As I said, it seems many phones that do not "support" SDXC still will mount and use the full capacity of these new 64gb cards if you format them on the phone.
So there is a good chance they will work, but not for sure, especially on a low end hardware spec like the Nook Color. But it seems even the original Nexus and early Motorola Droid phones will use them, so the Nook might too.

Thanks for the response and for the link. Guess I need to research before I provide misleading comments.
frankusb said:
The SD card is a block device, which means it's not directly addressable. It's not a matter of the number of address lines on the uProcessor. It's a matter of if the software driver can issue the correct commands to get to all the data since the bus interface hasn't changed. See here
Frank
Click to expand...
Click to collapse

I guess I gotta fork over $220 bucks to try out the Sandisk. There is a Kingmax 64gb card for $180ish, but I trust Sandisk.

40g, entire collection. Ah, to be noob again.
--------------------------------
Sent from my NookColor CM7.1

MISRy said:
40g, entire collection. Ah, to be noob again.
Click to expand...
Click to collapse
Whatever. I ripped my first mp3 while you were most likely in diapers.

Anyway, couldn't quite get myself to spend $220, so I got the Kingmax for $178. Hopefully it'll work as well as the Sandisk. I'll report back once I get it.

Sorry for resurrecting but do we have any updates on this? I've been seeing some pretty good deals on 64GB microSDXC lately and it would be great if they can be used on the Nook Color.

Someone is going to just have to bite the bullet and try it out. Until then all we can do is speculate really.
Sent from my NookColor using Tapatalk

I bought two Sandisk 64GB microSDXC cards a while ago and can confirm that they work for me. The card has to be reformatted with FAT32 but works flawless afterwards. I've formatted the cards in the devices.
I've used it with a Nook Color, Nook Tablet, Motorola Defy+, Huawei Ideos X3, and even in a Samsung Galaxy i7500. I've used it both with the stock rom as well as with cyanogenmod. Currently I'm using one of the cards to boot cyanogenmod 7.2RC1 from SD on my Nook Color.
My main use is in my Nook Color and Motoraly Defy+. I've experienced no problems so far.
Formating the card in the device takes a while and it looks like nothing is happening. You just have to wait. Once it's finished it mounts the card and you get a notificiation.

What class are they? Do you know the Sandisk part no.?

My cards are class 6 cards, the item# is SDSQY-064G-U46A. I don't know if the item numbers or cards vary in different countries. I bought mine in Germany.
There seems to be a newer version of the card with class 10. I haven't tested it since I currently don't need any more 64 cards but I wouldn't worry about compatibility.

leistungssurrogat said:
My cards are class 6 cards, the item# is SDSQY-064G-U46A. I don't know if the item numbers or cards vary in different countries. I bought mine in Germany.
There seems to be a newer version of the card with class 10. I haven't tested it since I currently don't need any more 64 cards but I wouldn't worry about compatibility.
Click to expand...
Click to collapse
Any chance of you running CrystalDiskMark on those cards and posting the results here or in this thread?
- Aerlock

You can download an app from the playstore called "SD booster" to help the read/write speeds if you experience lag on the larger 64 GB microSD card. It helps me out. There is links on google too where it has been bench-tested.
The link for this app can be found here. https://play.google.com/store/apps/details?id=de.mehrmann.sdbooster&hl=en. It reconfigures your caches for your microSD card to help speed up the read/write speeds.
You can pick up another app to bench test your read/write speeds also. Its called SD tools. https://play.google.com/store/apps/details?id=ales.veluscek.sdtools&hl=en
I used these tools to find the right cache size for my 64 GB card and have it performing as good as a stock 16 GB card with no modifications.

I did the benchmark with both cards. The first card was tested with my old notebooks internal card reader:
Code:
Sequential Read : 20.111 MB/s
Sequential Write : 8.460 MB/s
Random Read 512KB : 19.676 MB/s
Random Write 512KB : 2.405 MB/s
Random Read 4KB (QD=1) : 2.794 MB/s [ 682.1 IOPS]
Random Write 4KB (QD=1) : 1.280 MB/s [ 312.4 IOPS]
Random Read 4KB (QD=32) : 3.660 MB/s [ 893.6 IOPS]
Random Write 4KB (QD=32) : 1.397 MB/s [ 341.1 IOPS]
I tested the second card in my nook (booted from sd, connected via USB):
Code:
Sequential Read : 16.732 MB/s
Sequential Write : 7.148 MB/s
Random Read 512KB : 18.068 MB/s
Random Write 512KB : 2.559 MB/s
Random Read 4KB (QD=1) : 3.692 MB/s [ 901.3 IOPS]
Random Write 4KB (QD=1) : 1.404 MB/s [ 342.9 IOPS]
Random Read 4KB (QD=32) : 3.984 MB/s [ 972.6 IOPS]
Random Write 4KB (QD=32) : 1.428 MB/s [ 348.7 IOPS]
For comparison these are the results for the internal storage of my nook color:
Code:
Sequential Read : 17.543 MB/s
Sequential Write : 4.311 MB/s
Random Read 512KB : 16.842 MB/s
Random Write 512KB : 1.596 MB/s
Random Read 4KB (QD=1) : 3.624 MB/s [ 884.7 IOPS]
Random Write 4KB (QD=1) : 0.867 MB/s [ 211.7 IOPS]
Random Read 4KB (QD=32) : 3.803 MB/s [ 928.6 IOPS]
Random Write 4KB (QD=32) : 0.610 MB/s [ 148.9 IOPS]

Micro SD card. 64gb. Class 10. 1.5mb 4k speed?

Hi all.
My onboard storage for the note 2 is filling up fast.
I need an SD card.
I have done 7a bit of research.
Now it's all getting very complicated.
What I think I am looking for is
64gb sdxc
Class 10
But 4k write speed of 1.5mb
Apparently most class 10 have slow 4k write speed. 4k writespeed is used for many features with the faster non 4k writespeed reserved for intensive files.
I have tried to talk downv the above to no avail.
Is anyone able to help me find a card that complies with all three of the above requirements?

MSK1 said:
Hi all.
My onboard storage for the note 2 is filling up fast.
I need an SD card.
I have done 7a bit of research.
Now it's all getting very complicated.
What I think I am looking for is
64gb sdxc
Class 10
But 4k write speed of 1.5mb
Apparently most class 10 have slow 4k write speed. 4k writespeed is used for many features with the faster non 4k writespeed reserved for intensive files.
I have tried to talk downv the above to no avail.
Is anyone able to help me find a card that complies with all three of the above requirements?
Click to expand...
Click to collapse
If you want a 64gb micro sdxc card, your only choice is sandisk

sotodefonk said:
If you want a 64gb micro sdxc card, your only choice is sandisk
Click to expand...
Click to collapse
Thanks.
What is the writing speed on the 4k element.
Ive read that it can be as low as 0.01mb/sec for class 10 chips.

MSK1 said:
Thanks.
What is the writing speed on the 4k element.
Ive read that it can be as low as 0.01mb/sec for class 10 chips.
Click to expand...
Click to collapse
I dont have one, I say its your only option because its the only one with a reputable name.
You can see crystalmark benchmarks in amazon:
http://www.amazon.com/gp/customer-media/permalink/mo30F5R2E152MJZ/B009QZH6JS/ref=cm_ciu_images_pl_link
The write speed for 4k is between 1.4 MB/s and 1.7 MB/s depends on the reader, although there is one guy who got .5 MB/s in an asus card reader.
Some people uploaded screenshots for the wrong card, check if the benchmark its made on the 64GB micro sdxc card to be sure if its what you want

sotodefonk said:
I dont have one, I say its your only option because its the only one with a reputable name.
You can see crystalmark benchmarks in amazon:
http://www.amazon.com/gp/customer-m...2E152MJZ/B009QZH6JS/ref=cm_ciu_images_pl_link
The write speed for 4k is between 1.4 MB/s and 1.7 MB/s depends on the reader, although there is one guy who got .5 MB/s in an asus card reader.
Some people uploaded screenshots for the wrong card, check if the benchmark its made on the 64GB micro sdxc card to be sure if its what you want
Click to expand...
Click to collapse
Thanks.
I have done some reading and found the below so thought id share.
Net result is that the sandisk 64 gb ultra card is good.
It's 4k (random) speeds are fast enough.
No difference between ultra and mobile ultra other than age (though some suggest that the mobile ultra is only class6)
It also appears that u can buy ultra from US and mobile ultra from UK.
http://forums.whirlpool.net.au/archive/1582172
http://www.fonearena.com/blog/44593/sandisk-64gb-microsdxc-memory-card-review.html
http://forums.sandisk.com/t5/Mobile...tra-and-Ultra/m-p/289540/highlight/true#M1911
http://forums.sandisk.com/t5/Mobile...tra-and-Ultra/m-p/289540/highlight/true#M1911
forums.sandisk.com/t5/Mobile-memory-professional-cards/Difference-between-Mobile-Ultra-and-Ultra/td-p/281716
http://forum.xda-developers.com/showthread.php?t=1776601&page=2

May I ask why you need speedy 4k random writes.
For taking vids and pics, class 10s should work really well. You planning on using the drive as a swap partition perhaps?
swyped all these spelling errors from my galaxy note 2

finalhit said:
May I ask why you need speedy 4k random writes.
For taking vids and pics, class 10s should work really well. You planning on using the drive as a swap partition perhaps?
swyped all these spelling errors from my galaxy note 2
Click to expand...
Click to collapse
I just like to have the latest possible functionality if I am spending the money.
I have heard (I am no expert) that if you are running apps from the SD card then you need the 4k speeds.
My most important issue is that it appears to be unclear when you are buying these cards from Amazon.co.uk whether the cards are class 6 or class 10.
They never specify the "Model code"
E.g
http://www.amazon.co.uk/gp/aw/d/B005LFT40G/ref=aw_cr_item_title
www.amazon.co.uk/gp/aw/d/B007JTKM30/ref=aw_d_var_2nd_computers_txt?vs=1

When your writing big files...it finds a spot to them in and writes in sequential blocks ( as much as it can anyway)
When using apps, yup, I guess it would be writing tiny files so your performance might be impacted depending on your configuration. However, games don't really write to disk that often... Maybe when it's saving... but that would hardly affect you ux.
I dunno, I can't really think of a practical scenario when your ux would be impacted by this.
Ambiguous labeling seems to be a separate issue.
The second listing says class 10 (thats 10Mbps sequential write speeds)
swyped all these spelling errors from my galaxy note 2

finalhit said:
When your writing big files...it finds a spot to them in and writes in sequential blocks ( as much as it can anyway)
When using apps, yup, I guess it would be writing tiny files so your performance might be impacted depending on your configuration. However, games don't really write to disk that often... Maybe when it's saving... but that would hardly affect you ux.
I dunno, I can't really think of a practical scenario when your ux would be impacted by this.
Ambiguous labeling seems to be a separate issue.
swyped all these spelling errors from my galaxy note 2
Click to expand...
Click to collapse
Any idea on how I can ensure I am buying a bona Fide class 10 from Amazon?

That is the 40 euro question. You can't even tell if a card is a genuine sandisk, or actually 64 gb until you get ut. Some sellers are extra devious they trick the cards into reporting they are 64gb capacity, and your computer will say they are 64...but they will only store 4 or 2 gb (the seller rebranded a 2gb). This is specially ytue from ebay purchases.
Typically, personally anyway, I just go with a trusted seller...typically the ones specifically sold by amazon.
(Really love the stock keyboard but it needs autocorrect-on-space ala swiftkey. Going back to SwiftKey Flow beta... No number row though =( )
swyped all these spelling errors from my galaxy note 2

finalhit said:
That is the 40 euro question. You can't even tell if a card is a genuine sandisk, or actually 64 gb until you get ut. Some sellers are extra devious they trick the cards into reporting they are 64gb capacity, and your computer will say they are 64...but they will only store 4 or 2 gb (the seller rebranded a 2gb). This is specially ytue from ebay purchases.
Typically, personally anyway, I just go with a trusted seller...typically the ones specifically sold by amazon.
(Really love the stock keyboard but it needs autocorrect-on-space ala swiftkey. Going back to SwiftKey Flow beta... No number row though =( )
swyped all these spelling errors from my galaxy note 2
Click to expand...
Click to collapse
l was going to go with swift key too.
But then u can't use the handwriting mode.
If I buy from the US, are they likely to ship'to the UK?

I did a review of the new Samsung 64gb uhs1 cards against the SanDisk ones and they're by far faster.
http://forum.xda-developers.com/showthread.php?p=35447450

AndreiLux said:
I did a review of the new Samsung 64gb uhs1 cards against the SanDisk ones and they're by far faster.
http://forum.xda-developers.com/showthread.php?p=35447450
Click to expand...
Click to collapse
Those new ones from Samsung, where i can buy it in USA?

sotodefonk said:
Those new ones from Samsung, where i can buy it in USA?
Click to expand...
Click to collapse
They should be available now or in the following weeks if not.

AndreiLux said:
I did a review of the new Samsung 64gb uhs1 cards against the SanDisk ones and they're by far faster.
http://forum.xda-developers.com/showthread.php?p=35447450
Click to expand...
Click to collapse
Do u know if these will become available in the UK

* I was told by sandisk customer services that 'mobile ultra' and 'ultra' are the same, it's just marketing
* When you get a card test it with "h2testw_1.4" which will test that it's the size you bought
* Also test with CDM to see if it gives you the speeds you were expecting

tobydjones said:
* I was told by sandisk customer services that 'mobile ultra' and 'ultra' are the same, it's just marketing
* When you get a card test it with "h2testw_1.4" which will test that it's the size you bought
* Also test with CDM to see if it gives you the speeds you were expecting
Click to expand...
Click to collapse
That's fits in with what I have read before.
The real problem is trying to distinguish between class 6 and class 10.
It's never stated on the card itself so u can't tell if the seller is misdescribing.

Get the samsung MB-MGCGB
Class 10 (70 MB/sec Read, 20MB/sec Write.
I've had the sandisk and when transferring 4-5 gig movies there's absolutely no comparison... but they're about $100 for the samsung...

sotodefonk said:
If you want a 64gb micro sdxc card, your only choice is sandisk
Click to expand...
Click to collapse
yup yup

I have the 64gb SanDisk
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}