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Hi everyone,
I'm confused which card is more compatible for O2 XDA IIi (Alpine) apart from the brand ?
is it:
SD
or
MMC / MMC+ / MMC Dual Voltage ?
Thanks
AFAIK both SD and MMC card works for the xda2i?alpine.though you have to buy a card with a fast write/read speed.
As far as I know (bar the voltages) the only difference between SD & MMC is that the MMC card does not have a 'write protect' sliding tab, whereas the SD cards do.
Joe Pinball
P.S. first post!
P.P.S. still waiting to get my Alpine!
Here is the data I've found from Kingston website:
<h3>SD</h3>
Secure Digital, introduced in late 2001, is a second-generation and more popular
derivative of the MultiMediaCard (MMC) standard (see section 7.4) that is backwardcompatible
with current MMC cards.
The Secure Digital format includes several important technological advancements over
MMC. These include the addition of cryptographic security protection for copyrighted
data/music and a 4X increase in data transfer rates. The SD Card Association sets the
specifications for Secure Digital cards.
To help support higher-capacity cards, SD cards are slightly thicker than the original
MMC cards. This means that devices designed to support SD cards may also accept
MMC cards (if the host device is not strictly limited to SD media for data security
reasons). However, devices exclusively designed for MMC cards will not support the
thicker SD cards at this time.
<h3>MMC</h3>
MultiMediaCards are one of the smallest Flash cards available, about the size of a
postage stamp. They were introduced in 1997 and initially used in the mobile phone
and pager markets. Today, they are commonly used in digital cameras, mobile phones,
and MP3 players. The MultiMediaCard Association sets the specifications for MMC.
Finally, the best option would be the SD card for the Expansion based on the speed.
thanks mate.
SD is MMC with data encryption (hence Secure Digital). Supposed to stop unauthorised copying, etc - but I don't think it's a defaulted feature, how else would you be able to read your own data when you swap cards between devices
SD has a much faster read/write rate than MMC, although the latest generation of MMC cards are faster than SD. However, they're also more expensive, and I'm not sure if they're full compatible with existing SD equipment (although MMC and SD are cross-compatible, so who knows... If you want to buy an MMC+ card and trial it, fine by me ).
Based purely on a weigh-up of cost vs. speed, SD is the more viable option at the moment.
According to the Kingston website, the MMC+ cards will work with the I-Mate PDA2.
It also states that the max size for any card is 1GB though???????
Who wants to put them straight?
wooww thank you very much indeed my friends.
now i really understand the difference.
this forum is ROCKZZZ !!!
Here is a problem... I've tested 4Gb SD card's FAT16 write speed using XDA IIi. And it is 2 times slower than one on 2Gb SD card(both Transcend, 150x). Nearly 630kb/s(2Gb) and 375kb/s(4Gb).
So, speed is unacceptable.
Will 4Gb MMC solve this speed problem?
Hi
You need to reformat you SD4Gb in Fat32. I had same problem like you with MMC+ 4Go and SD 4Go 150x, both from transcend. I reformated in FAT32 and they are more quicker.
Try it and ket me know.
You can use Pocket Mechanic from Anton Tomov which is a very good software.
Cheers
Hmm... Same benchmark gives me even slower result with FAT32... What cluster size are you using?
Best results achived with FAT16 64Kb cluster... Using SKTools for benchmarking.
Sectors per cluster:64
Bytes per sector: 512
Cluster Size is 64x512 = 32768
Hope it helps
Could anybody tell me, why my new SD Card (Panasonic 2 GB Class 6) is much slower on my Alpine than my old SD Card (Panasonic 2 GB Class 2)? Here are the results from the SK Tools benchmark :
Class 2 Card: Read 6187 kb. Write 636 kb.
Class 6 Card: Read 729 kb. Write 481 kb.
Isn't it funny?
Perhaps I should format the SD Card properly?
Any ideas?
Thank you.
are cards empty when you check write speed?
class tells about writing speed on complitely empty cards
I tried both benchmarks, with the empty and the full card. The class 2 is much faster, especially in the write result. Unfortunally I formatted the new card on my device, with the effect that the card was become more slower. After that I formatted the card on my computer, now it's better, but nevertheless slower than the old one.
maybe it's something wrong with the card
the 2nd one is almost 10 times slower readed :/
did you check speeds on PC?
maybe PPC just can't handle with faster card
deezer said:
maybe it's something wrong with the card
the 2nd one is almost 10 times slower readed :/
did you check speeds on PC?
maybe PPC just can't handle with faster card
Click to expand...
Click to collapse
Well, that's my question. Where can I get the adequate information? How can I check the speeds?
use this
http://www.simplisoftware.com/Public/index.php?request=HdTach
Now I've found out that SD/SDHC Memory Card file systems formatted with generic operating system formatting software do not comply with the SD Memory Card specification. You need a special formatting program that complies with the SD Memory Card specification.
Because I have a Panasonic card, I took the Panasonic free SW (
link: http://panasonic.jp/support/global/cs/sd/download/sd_formatter.html).
The benchmark results are: Nearly 14000 KB/s (read), but still 470 KB/s (write) only.
No idea, how to increase the write performance.
Has anyone seen a SDHC fix for 4/8 GB SD Cards available for Alpine?
Anybody tested a fix?
If HTC has a box with SDHC compatible, then there must be a fix for it.. Or maby soneone can help us to make that registry fix and new files required for the fix..
4GB SD cards work as standard on the Alpine anyway no fix required as long as they are fast, the 4Gb Topram SD in mine is a 150x and works like a dream. I have no Idea if an 8gb works but if it conforms to the standard then it might- 4gb is enough for me
Compatibility issues with 2 GB and larger cards
from: http://en.wikipedia.org/wiki/Secure_Digital_card
Compatibility issues with 2 GB and larger cards
Compatibility with 2 gigabyte and larger SD cards has been poor, due to the SD/MMC protocol's using a 32-bit address field denominated in bytes. The SDHC standard addresses this limitation by using 32-bit block addresses instead. Both SD and SDHC are traditionally accessed as 512-byte blocks on 512-byte boundaries, so the change to host software or firmware is minor but required. Before SDHC was standardized, various manufacturers "extended" the SD control block fields for their 2 GB and 4 GB cards in different ways. Those cards are incompatible with many SD and some SDHC devices, as they conform to neither standard. All SDHC readers work with standard SD cards.[SD Compatibility, CARDSPEED - Card Readers and Memory Cards, December 1, 2006]
Many older devices will not accept the 2 GB size even though it is in the revised standard. The following statement is from the SD association specification:
"To make 2 GByte card, the Maximum Block Length (READ_BL_LEN=WRITE_BL_LEN) shall be set to 1024 bytes. However, the Block Length, set by CMD16, shall be up to 512 bytes to keep consistency with 512 bytes Maximum Block Length cards (Less than and equal 2 Gbyte cards)."[SD Group Technical Committee (September 25, 2006). "Section 4: SD Memory Card Functional Description; 4.3.2: 2 Gbyte Card", SD Specifications, Part 1: Physical Layer Simplified Specification (PDF, HTML), Version 2.00, SD Card Association, p. 19. Retrieved on 2007-02-23. ]
Since all cards up to and including the 1 GB card use a fixed 512 block size, some device drivers do not handle the larger block size and will not even recognize the 2 GB card. For example, the SanDisk web site shows examples of devices such as the iPAQ 1910 that will support only 1 GB cards and the Epson Photo RX300 Technical support says they support only 1 GB cards in the SD slot. Users of many early card readers have found that they also support only cards up to 1 GB.
Click to expand...
Click to collapse
As I can not afford to buy a non-standard and non supported card here in Turkey, I am searching for a legit fix. I haf my Kingston replaced twice due to a problem. In other brands, I simply could not do this. That'a why I am looking for a working fix.. But thanks for notifying...
i had probs with 2gb cards but then i found if its formated as standard FAT (FAT16) not FAT32 they work fine.
Guys,
Got a pretty important question; Yes, I've searched. Don't flame the n00b
Using the N1 as a mass storage device, how fast is the transfer speed?
and
Does the speed/class of the SD card make a difference?
Cheers,
It is ass fast as memory stick. Yes, class of sd card makes all the difference.
I was kind of looking for speed in MB/sec
We all know memory can sticks vary from 1MB/sec to 20MB/sec
Fastest I've seen my transfer speeds are 5 MB/s
This very thing is a problem i am having with my N1. i have a 4gb class 6 card in it and when i mount the N1 to my PC i get transfer speeds of 500k to 1mb asec, but then when i plug the SD card into a USB reader i will get speeds up around 8mb asec. I have USB debugging enabled and it doesn't help. So right now transfer speeds to be blow big time. Not sure why it is doing this or whats wrong.
Any info on this? My phone tops out at around 3 megs. I hooked up a Moto Droid and it was moving stuff at 12 Megs a sec.
Experiencing same sluggishness w/ class 6 card.
I think transfer speeds from N1 to PC are independent of the SDcard when plugged in through the USB cable (unless it's like a class 2).
The actual cable and the N1 restrict speeds as long as you're acessing the SD via USB. You're getting differing speeds when putting it in an adapter because the adapter has different transfer speeds and doesn't need to go through the N1 to transfer.
You're going to be capped when transferring from N1 to pc via USB.
on average with the stock 4GB card when in the N1 I see around 1.5-3mb a sec... When I plug the card directly in a card reader I get 5-8mb a sec. It's much faster for me to turn the phone off, take out the card and stick it in a card reader if I'm transferring any more than a few hundred MB.
Just wanted to bump this, as I'm using an 8 gig card, and froyo 2.2 now. I'm getting consisten 3.5 MB - 4 MB, where as before I couldn't break 2 megs. Not sure what class the card is.
Thread update: I now have a Desire with 16gb Class2
7-8MB/sec Writing.
Reading is even quicker.
Transferring a 800mb file to N1 in mass storage (sandisk class 6 8gb) I got about 2.5mb/s using original htc data cable
Using a card reader i got 11mb/s
hellbringer626 said:
Transferring a 800mb file to N1 in mass storage (sandisk class 6 8gb) I got about 2.5mb/s using original htc data cable
Using a card reader i got 11mb/s
Click to expand...
Click to collapse
How is the card reader connected to the computer? Does it go into a USB port or is it a flash card reader built into a laptop?
Wow. 11MB/s is really fast - are you sure of that number? Sandisks are known generally overachievers, but Class 6 is only rated at 6MB/s write so if that number is right then - wow.
JCopernicus said:
Just wanted to bump this, as I'm using an 8 gig card, and froyo 2.2 now. I'm getting consisten 3.5 MB - 4 MB, where as before I couldn't break 2 megs. Not sure what class the card is.
Click to expand...
Click to collapse
Those sound like the theoretical class 4 speeds.
I have a class 6 16GB card and even with froyo, I can't break the 2MBps rate (Running win7 x64).
Stock froyo/FRF50 or a custom rom based on it?
I just recently got my first Class 6 SDHC 8GB card expecting it to be a lot faster transferring than my stock Class 2 4GB. It's the same. But, when I put my class 6 into a card reader, it writes at 15mbps or higher. Sucks that we have to turn the phone off to remove the SD card.
Here are my test results (on the phone, not mass storage), hope this helps.
SD Card: 16GB RiData Class 6, from newegg.com
Application: J BenchMark 1.0 (market)
Test media: SD Card
Data Size: 10.0 MB
Buffer size: 8KB
Performance over 3 Runs.
Write performance (MB/s): 7.78, 9.29, 11.92
Read performance (MB/s): 12.33, 16.61, 17.39
britoso said:
Here are my test results (on the phone, not mass storage), hope this helps.
SD Card: 16GB RiData Class 6, from newegg.com
Application: J BenchMark 1.0 (market)
Test media: SD Card
Data Size: 10.0 MB
Buffer size: 8KB
Performance over 3 Runs.
Write performance (MB/s): 7.78, 9.29, 11.92
Read performance (MB/s): 12.33, 16.61, 17.39
Click to expand...
Click to collapse
SD Card: 8GB Transcend Class 6, from amazon.com
Same App/Settings
Performance over 3 Runs.
Write performance (MB/s): 4.57, 4.7, 5.81
Read performance (MB/s): 6.37, 6.73, 7.23
Much slower.