Hi fellow Defyers,
Didn't get any answers to my last post, so I obviously asked the wrong question.
I'm wanting to know what's the correct, fastest speed Class microSD card for my Defy. Nobody really seems to know.
There should be a spec, but I can't find it. I've searched all over this forum, but haven't found a answer. There are lots threads about which brands and classes work and which don't, but nothing much about real world speeds. I know that speeds vary. It depends on the Hardware, ROM and other Software running, but there must be a "best" answer.
I suspect my Defy SDHC card slot is really Class 6 speed, but lots of people report using Class 10 SD cards. What I want to know is are they actually faster?
I've installed the free "SD Tools" SD card Speed Tester app from the Market - Google Play. It's a very simple app, but gave me no problems. Except, speeds vary. I suggest a Reboot, don't open anything else and wait 3 minutes before running, to get the best result.
I get 9.3MB/s Write and 14.4MB/s Read from an ADATA 4GB Class 6 card.
I'm running Android 2.2.2. Can't really root it 'cos it's the Company-supplied phone.
Anyone getting much better than that out of Class 10?
Please post your results [Defy Model, Android ver, Card Make, Size, Class, Test App, Write MB/s, Read MB/s] here!
Mine:
MB525, 2.2.2, ADATA, 4GB, Class 6, SD Tools, Wr: 9.3MB/s, Rd: 14.4MB/s
Cheers,
D
DefiAnt2 said:
It depends on the Hardware, ROM and other Software running, but there must be a "best" answer.
Click to expand...
Click to collapse
There's apparently another factor that I haven't tested myself and forgot to mention, but that's SD Card format. Seems the cluster size also makes a difference, though that will (should, may?) depend on the type of test. Sustained, large reads and writes (as done by SD Tools) should be faster with a larger cluster size, and I think sustained speeds are what matters for shooting video, or playing HD movies.
To determine your card Format and Cluster size (one way - are there better ways?) is to connect to USB, go to a Command prompt and run CHKDSK X: where X is the Windows Drive letter for your SD Card. The first line gives the Format type. Further down, the Cluster size is the number of "bytes in each allocation unit."
BTW, if CHKDSK says you have errors on your SD Card, well, be careful! You may have errors. Or, you may have a Card Compatibility issue. But I wouldn't go Fixing them with CHKDSK. I'd investigate carefully as to the cause before going further. Like, take the card out of your phone and connect it to a PC using an SD Card Reader, and check it again. If there errors aren't still showing, you definitely have compatibility problems. And, if there are still errors, it very likely means your SD Card data IS corrupted, and was probably caused by a compatibility issue or some other problem like a phone lock up while writing data, or maybe a Battery Pull (VERY BAD IDEA) also while the card was being written.
I'm not exactly sure about how to determine the Sector size for SD Cards (which is why I'm talking Cluster size), but for Hard Disks it's normally 512 bytes / sector. SD Cards could, I suppose be different as they are not rotating media, but I haven't yet figured out how to get that data out of them. Anyway, assuming 512 bytes / sector, 32k sectors (32,768 bytes) per cluster is obviously 32,768 / 512 = 64 sectors per cluster.
Please feel free to post your results [Defy Model, Android ver, Card Make, Size, Class, Format, Cluster size, Test App, Write MB/s, Read MB/s] here!
Mine:
MB525, 2.2.2, ADATA, 4GB, Class 6, FAT32, 32k clusters, SD Tools, Wr: 9.3MB/s, Rd: 14.4MB/s
Cheers,
D
P.S. I found a cheap 8GB Class 10 card... Interesting!
just tested my configuration:
bayer mb525, cm7.2 (2.3.7), kingston class 10 16gb sdhc, formatted fat32 with 64k cluster size, and my results are 10.7w/25.2r.
sent from my cm7 defy...
Please ask all questions in Q&A. Thread moved there.
I get 4.5mb/s write -14.3mb/s read on an class 2 sd I think, not sure, MB526 2.3.6 stock Android
Hi Feche, zakoo2
Thanks for that.
Turns out, nothing is simple. I have now found that it depends a lot on what "services" are also running when you run the test.
For example, if I have Data enabled, Bluetooth enabled and Satellite enabled (but none active), I get significantly lower readings, especially for Read.
On top of that, SD Tools seems to give more consistent results if you ignore the first test and run it a second and third time.
However, I have also found that my MB525 DOES get faster Read results with a Class 10 card. Only slightly faster for Write though.
I guess this means the MB525 Hardware is (more-or-less?) Class 10 capable. At least, for Read. Or, it may also depend on the individual card Manufacturer. A-Pacer not being a Top of the Line brand.
My best results, with all the services turned off:
MB525, 2.2.2, A-Pacer, 8GB, Class 10, FAT32, ??k clusters, SD Tools, Wr: 9.7MB/s, Rd: 20.7MB/s
(Forgot to check cluster size, sorry.)
I'll post other results later.
Cheers,
D2
Related
Hi.
I have many questions which have been skimmed across on quite a few other topics in this forum, I wish to ask more in depth questions for all you IT Brainiacs which I lookup to greatly 8)
I own a XDAIIi and a 512MB Kingston SD Card.
Using 'Storage Tools' by softwinter...
http://www.softwinter.com/storagetools.html
The SD Card is formatted:
FAT 16 (Backup FAT)
Cluster Size (The Largest Size)
I also use TomTom Navigator 3.07 with GPS 3.07.
I experience frequent lockups whilst driving.
What I am asking you guys is what is THE BEST AND ULTIMATE SD CARD to use in my XDAIIi with TomTom.
I know about all the Sandisk Ultra II/Extreme III but pocketgps.co.uk...
http://www.pocketgpsworld.com/storage-card-compatibility.php
Do not advise using Sandisk cards due to their poor performance.
Do any of you guys recommened how to tweak my SD card but increasing/decreasing the cluster size or formatting the card with FAT32 !? Or are there any REG Hacks that people know of how to increase the stability of the XDAIIi using the SD Card slot.
Also are there any solid specs of HOW fast the XDAIIi SD Slot can Read/Write to SD Cards?!
Sorry to ask such harsh, to-the-point questions but I have learn so much from this forum and will be donating money soon as if I were to ask or ring the customer services of the products I own they would charge a bomb on phone calls and not answer my questions.
This forum does neither of those
Thanks in advance,
lydiachris
SD Ram XDA IIi
The only card that I have found to reliable with the XDA IIi is the Kingston, I have the 1GB version currently formated FAT16 32 Secs, 512 bytes per sector and Tom Tom functions perfectly...Hope this helps...
Hi there. thankyou for VERY quick reply.
Please could you explain more about the way you have formatted your card.
I understand the FAT16 bit but what do you by 32 SECS and 512 bytes per sector.
Thankyou again,
lydiachris
ps. I take it that you are using the standard Kingston (blue), not the elite pro version (white)
The Kingston "Elite Pro" range is miles faster than the standard kingston SD cards, and only about 20% pricier (at http://www.picstop.com/securedigital.htm). Just replaced my Kingston 256 with an Elite Pro 1GB, and Tomtom flies! (5 times faster to load)
PS if you're using Tomtom's GPS 3.07, you might wish to change to one of the earlier versions that doesn't hijack your BT stack (Pocket GPS world has loads of info and downloads for this)
Hi there. Are you serious?!? Do you have a XDAIIi ???
I am currently using a standard blue kingston 512MB SD.
But I have just bought an Elite Pro 512MB SD Card for £33 which I am quite pleased with
Please could you post some more info on the formatting question I have posted above.
How did you format your card Fredrick_Fredrickson.
Also what does the 'Cluster Size' of an SD Card mean. I understand that if you have many large files i.e. like TomTom maps (all the individual files) then it is better to have a larger cluster size than say if you have many little files like photos.
Am I correct in saying that!?
Cheers,
Lydiachris
Ps. has anyone got one of these?!?!?!
http://www.kingston.com/digitalmedia/sdultimate.asp
Very serious!
5 times quicker to load.
Just did a quick back to back ABA test, starting up Tomtom.
Kindston Elite Pro (1GB): 15 seconds
Kingston Standard (256Mb): 53 seconds
Both cards formatted FAT32 with default cluster sizes.
Test on an XDAII (not XDAIIi)
Note that the new Elite Pro cards are also blue, like the standard ones.
Hi thankyou.
That is really amazing!!!!
Could you please look further into how your cards are formatted, i.e. cluster sizes.
Why FAT32??? Doesn't this cause lockups whilst your using tomtom????!!!!!
I thought that SD Cards usually work better with the FAT16 file system?
Actually, do you experience any lockups at all with tomtom???
Regarding the colour of the cards, what colour is your elite pro card???
Because if you go on the link that I posted above, they are actually the ultimate kingston card.
With 133X read / write etc...
Cheers,
lydiachris
The manufacturer of Storage Tools says (http://www.softwinter.com/storagetools_faq.html):
Q: What file system I should use FAT12, FAT16 or FAT32?
A: It depends on the storage card size. For larger cards, 64MB and up, the answer is almost always FAT32. FAT32 can be incompatible with digital cameras.
My cluster size is:
256MB standard card: 512 bytes
1GB Elite pro: 4Kb
I've not had any trouble with lockups (touch wood)
My card colour is blue, but it is definitely an Elite Pro, not an Ultimate.
Hi,
For those experiencing lockups using TomTom 3 and XDA2i please look at my thread, its not the SD card its the Phone that causes the lockups.
http://forum.xda-developers.com/viewtopic.php?t=21002&highlight=
Cheers
Blue
Hi thankyou.
But how the hell do you turn your bluetooth on with flight mode enabled?!?!
It is impossible on a XDAIIi.
UNLESS your using a wired gps receiver?!?!?
SD Card and Formatting
I don't know if anyone is interested but I have done extensive testing on my XDAIIi with my Kingston Elite Pro 512MB SD Card.
Using Spb Benchmark
http://www.spbsoftwarehouse.com/products/benchmark/?en
and softwinter's storage tools
http://www.softwinter.com/storagetools.html
I have tried formatting my SD Card withmany various differnt set-ups.
I.e. differnt cluster sizes, FAT 16 and FAT 32, back-up FAT or not.
And by using the 'storage card' benchmark option on SPB Benchmark I have found that my Kingston Elte Pro card functions best and fastest by formatting it like this...
FAT16
512 byte Sector Size
64KB Cluster Size
Backup FAT - NO.
Hope this helps some people, maybe other people can try with their makes of storage card and post their results.
The next 'best' format was with..
FAT32
512 byte Sector Size
32KB Cluster Size
Backup FAT - NO
Also another observation I made was if you format the card using the first set up but have
Backup FAT - YES
There is a significant decrease in speed operation.
As I said above I format my cards in my XDAIIi or through my laptops media card reader.
Hope this helps!!
Happy testing 8)
Cheers,
lydiachris
Happy new year guys. I bought two microsd cards. One is a PQI 2GB microSD card for flashing. Another one is a Ridata 4GB microSDHC card for everyday stuff, with a speed class of 6. I don't know the class of the PQI.
I noticed that when copying files from the pc, or when just copy pasting files within the Hermes, the writing speed is very slow. For both cards, the PQI and Ritek, they're around 400 kB/s to 600 kB/s. I used both WM5torage and activesync and they're both this slow. Even for a class 2 card, such speeds are slow. I RMAed the PQI one due to CRC errors when copying. The Ridata has no errors but is still very slow.
I searched the forums and installed the SD tuneup.cab file, restarted the Hermes and its still the same writing speed, around 400kB/s. I used the microsdhc in a card reader in a pc and it writes at 6 MB/s. What could be wrong, why such a writing speed difference? I have red about posters with writing speeds as much as 9MB/s with their phones in the Hermes accessories forum.
The specs of my phone are:
Cingular 8525 Hermes 100
PDACornerPro.V27
Radio 1.56
HardSPL v7
Ridata 4GB microsdhc class 6
Any suggestions, comments? Thanks.
Mate, join the club... I don't really believe that when connected through activesync you will get very fast speed copying. Its ALWAYS been slow as a stoned snail when copying through the phone. sd card readers move like lightening in comparison.
Don't believe you're gonna find an answer to the slow speed problem.
Cheers...
You mean from the very start till now, the Hermes really writes slowly? But some people on the Hermes accessories forum have write speeds up to 9MB/s. Maybe there is a fix/tweak somewhere I don't know about and still not able to find through searching? Any ideas? Thanks.
I've never found it. Most threads I've read about this issue are lamenting the fact it has such a slow read/write speed when connected through activesync.
I generally backup and transfer files through an sd card reader.
Cheers...
Thanks for the reply. Maybe I'll just use a card reader to save time. But those folks at "What brand SDHC card is everyone using?" thread have speeds up to 9MB/s when writing. Aren't they using the Hermes? Or they're using a card reader?
Probably a card reader. They may also be talking about when transfering files to/from sd card when using the Hermes's own file manager as that is fairly fast. I use a class 6 8Gb card for reading Tomtom maps and there is no lag, had a bit previously with a 2Gb card.
I believe the hangup is in microsoft's active sync program. No0t sure about those using vista's own transfer app.
Cheers...
ultramag69 said:
Mate, join the club... I don't really believe that when connected through activesync you will get very fast speed copying. ...
Click to expand...
Click to collapse
Actually, Activesync can be fast.
Activesync on an XP machine copying to my Herm100 is quite slow, a card reader is much better, but the same Activesync copied to the latest HTC (don't know the model) slidey keyboard phone's internal memory in comparatively lightening speed.
So is there different configurations or drivers for the USB connections on our phones and/or ROMS ?
G.
As you said
Ogier said:
Activesync copied to the latest HTC (don't know the model) slidey keyboard phone's internal memory in comparatively lightening speed.
G.
Click to expand...
Click to collapse
Maybe something in the hardware of the newer phones because if it was software, since the chefs use the ported os of the later devices, we should also be getting better speeds if we had updated the OS. I'm currently using build 21109 and I haven't noticed a speed increases...
Thanks for the replies guys. I think its really the hardware of the Hermes that is slow. I bought a cheap $1 card reader and its very fast compared to the Hermes' own card reader. I used Sisoftware sandra to bench my cards. My RMAed 2GB PQI card writes at around 6.5 MB/s while my Ridata 4GB card writes at around 5.4 MB/s. What a difference a dollar makes
I searched similar threads, but i found no proper answer to my question.
Is this a general android-build problem on the HD2?
I tried it with different PC's (XP/W7) and Roms (SD and NAND) and everytime
i get a only a transfer rate between 300 to 500 kbyte/s
(this is really slow! WM 6.5 connection was up to 10 Mbyte/sec)
It's a C10 sdcard and i already installed the SD read forward patch with 2048kb.
So internal reading/writing speed is not the problem.
What can i do to speed up the USB - Connection ??
(...please don't tell me to use a cardreader - this was not questioned!)
thanks!
there is a solution i believe... check out
http://forum.xda-developers.com/showthread.php?t=1010767
hellraiser-rh said:
I searched similar threads, but i found no proper answer to my question.
Is this a general android-build problem on the HD2?
I tried it with different PC's (XP/W7) and Roms (SD and NAND) and everytime
i get a only a transfer rate between 300 to 500 kbyte/s
(this is really slow! WM 6.5 connection was up to 10 Mbyte/sec)
It's a C10 sdcard and i already installed the SD read forward patch with 2048kb.
So internal reading/writing speed is not the problem.
What can i do to speed up the USB - Connection ??
(...please don't tell me to use a cardreader - this was not questioned!)
thanks!
Click to expand...
Click to collapse
I hate you man i was opening Q&A to post exactly about the same issue!
However i had a very satisfying SDcard read and write speeds, that is when i formatted it with SD formatter tool and WITHOUT any partitioning of it!
Today i wanted to try a sence build with EXT partition so i formatted the SDcard with the internal Partitioning tool of CWR to 1GB EXT. Then i formatted the SDcard (both FAT32 and EXT) with CWR.
I flashed a ROM and went to USB storage mode, and i was shocked!
The SDcard is now muuuuuuccccchhhh slower!!! Why is that?! And what can we do about it?!
kiki_tt said:
there is a solution i believe... check out
http://forum.xda-developers.com/showthread.php?t=1010767
Click to expand...
Click to collapse
Man he said that he applied that, besides that only affects internal speeds!
So can I just format my 32gb class 10 stick and run 1 fat32 partition and enjoy better performance or do we need the ext3 partition? Mines only like 200MB or so.
If using windows do you have some sort of Virus Scan going on. Is the USB hub on the computer really at USB 2.0 or more?
yep. It's a external powered 7 port usb 2.0 hub. When I plug the micro sdhc card into my usb card reader which plugs into the hub I get write speeds of 15MB/s+! Then I plug it in the phone and It pulls off 2MB/s barely. This is a CLASS 10 32GB Micro SDHC card. I changed the read_ahead_kb to 2048. No change. I'll test out 3072 and 4096. I think there's some driver issue with windows and the android usb driver or something. It's slow on several machines all operating at usb 2.0 specifications. Do we need to install software for the device? If so let me know! I get an unknown device when i plug the phone in and not usb mass storage, it tries to install the Android internal memory driver with no success. Supposedely google has a special driver for windows where u need the java developtmental sdk and the google java sdk. I'll update later. Any suggestions would be killer awesome!
any idea?
I've got a USB 2.0 connetction and the sdcard is not the Problem.
With my SDHC-reader in the same USB-port i get the normal speeds!
And i don't had this problem with WM6.5!!
With WM6.5 my spped was similar to the USB-reader!
But now ... with Android in NAND.....
The Speed problem occurs at all my PC's (XP,Vista and W7) and
with all the old SD-Build's (i thought that was an SD-Build problem)
and now with the NAND-Build (rafpigna Sense HD 4.02 ext) nothing changed !
So it is a general problem I think, not only me
Well, I was using dual mount SD for mounting the SDCard to the PC and the writing speed on the SD (class 6) was about 900KB ! But after I tried the native android mounting it was risen up to 3.4MB -which is also much slower than the card reader (~7MB)-
Same problem here ...
from the boot loader i get better write speeds ...
i tried ftp transfer too , no diferince in speed (still around 800 kbs).
i tried over wifi , still no difference.
iam using:
Pyramid HTC Europe 1.35.401.1 - Real 3D V2.3
I found out how to fix the problem. It lies within windows disk checker. Automatically fix file system errors, and Scan for and attempt recovery of bad sectors. This will take a long time depending on your speed and size of your memory stick. I do this when my speeds slow down. For my 32GB Class 10 card, it could take 2-4 Hours. However I'm getting 12-16MB/s write using windows and CWR. Make sure your device is being detected at USB 2.0 Speeds. Trust me! Doing it once ever couple days your speeds will be faster and faster. Even exceed the class specification of your card. This fixes the slow read/ write speeds!!!!
CYA
1chris89 said:
I found out how to fix the problem. It lies within windows disk checker. Automatically fix file system errors, and Scan for and attempt recovery of bad sectors. This will take a long time depending on your speed and size of your memory stick. I do this when my speeds slow down. For my 32GB Class 10 card, it could take 2-4 Hours. However I'm getting 12-16MB/s write using windows and CWR. Make sure your device is being detected at USB 2.0 Speeds. Trust me! Doing it once ever couple days your speeds will be faster and faster. Even exceed the class specification of your card. This fixes the slow read/ write speeds!!!!
CYA
Click to expand...
Click to collapse
ill try it ... reporting back after trying...
ok not working on the phone... ill set the sd card into a reader and try it out there
dint work at all ... some one else should feel free to confirm this
here is a bug report for this problem:
http://code.google.com/p/cyanogenmo...etwork Owner Summary Stars Priority&start=100
Ok, sorry. I'll start at the beginning and explain every detail on how to get amazingly excellent performance from you sd card. Your going to be required to format it to fat32 64kb cluster for optimum performance. That's #1 and required. If you need your ext3,4 etc partition. I'm sorry. You will have to continue to bare the poor performance. You need a raw fresh sd card. Then I would run a disk check to correct any internal errors that windows uses, with all options checked this should take a while to complete. On my 16gb class 2 it takes atleast 45 minues and 2 hours on my 32gb class 10. Windows disk checker perfects the clusters and the file system integrity. Run it once on a fresh sd card. Then transfer a file 100MB or larger to get good speeds. Transferring a ton of smaller files will always be 50-75% of your class specification. There is no way around this. The card will transfer at it's class when transferring large files. If the card was able to transfer at it's specified class with small files, would require more energy to perform the task and cause the card to overheat since it's performing more operations a second with a lot of small files compared to a few large files. One thing you will always need to keep in mind is the performance is very delicate and will not be maintained for long if you don't take extra special care of safely removing the device from the computer. I've been lucky to just turn off usb mass storage when the transfer is complete and have maintained my speeds this way. However before I dialed in to how to keep it performing excellent I would constantly cause the card to perform way worse after only a day or 2 after the optimization. To keep it running optimum make sure to run windows disk checker once a month or when it slows down. Make sure you format using either Windows format function from my computer or Disk Management. I have found that the windows methods are far superior to maintaining excellent performance since Windows writes the format data to the card in the manner it prefers to use on a daily basis. Third party applications perform the same simple "similar" task in a different manner technically speaking. I have noticed performance loss from tests I have ran comparing 3rd party format compared to windows format. Also the 64Kilobyte cluster size performs the best on all files sizes. Do not use anything smaller than that. Also a 3072KB read ahead in android on average performs better than a 2048kb read ahead. If you have any additional questions. Don't hesitate to ask.
Thanks cya!
Same phone on Mac & Windows
I have tried the same phone Samsung Galaxy S2 doing a 1 GB write to SD on a Windows machine vs a Mac. The Mac transfers in about 5 min the Windows machine takes about 20 min. Both machines are with the External SD mounted and copy and paste a folder with 10,000 files in it.
I then tried it with Motorola Atrix and get the same results.
I need a way to rapidly write 8GB of data every night to 46 phones... No I am not going to take the SD cards out of the phone and use a card reader.
Anyone have any idea what could be causing the slow down on Windows?
Read the above post and it will fix your problem.
1chris89 said:
Ok, sorry. I'll start at the beginning and explain every detail on how to get amazingly excellent performance from you sd card. Your going to be required to format it to fat32 64kb cluster for optimum performance. That's #1 and required. If you need your ext3,4 etc partition. I'm sorry. You will have to continue to bare the poor performance. You need a raw fresh sd card. Then I would run a disk check to correct any internal errors that windows uses, with all options checked this should take a while to complete. On my 16gb class 2 it takes atleast 45 minues and 2 hours on my 32gb class 10. Windows disk checker perfects the clusters and the file system integrity. Run it once on a fresh sd card. Then transfer a file 100MB or larger to get good speeds. Transferring a ton of smaller files will always be 50-75% of your class specification. There is no way around this. The card will transfer at it's class when transferring large files. If the card was able to transfer at it's specified class with small files, would require more energy to perform the task and cause the card to overheat since it's performing more operations a second with a lot of small files compared to a few large files. One thing you will always need to keep in mind is the performance is very delicate and will not be maintained for long if you don't take extra special care of safely removing the device from the computer. I've been lucky to just turn off usb mass storage when the transfer is complete and have maintained my speeds this way. However before I dialed in to how to keep it performing excellent I would constantly cause the card to perform way worse after only a day or 2 after the optimization. To keep it running optimum make sure to run windows disk checker once a month or when it slows down. Make sure you format using either Windows format function from my computer or Disk Management. I have found that the windows methods are far superior to maintaining excellent performance since Windows writes the format data to the card in the manner it prefers to use on a daily basis. Third party applications perform the same simple "similar" task in a different manner technically speaking. I have noticed performance loss from tests I have ran comparing 3rd party format compared to windows format. Also the 64Kilobyte cluster size performs the best on all files sizes. Do not use anything smaller than that. Also a 3072KB read ahead in android on average performs better than a 2048kb read ahead. If you have any additional questions. Don't hesitate to ask.
Thanks cya!
Click to expand...
Click to collapse
Hi!
Thank you for this thorough and correct advice. It solved my problem with my SDHC class 4 card used in a Samsung Galaxy Gio. My computer (Win7) could write on the card with only 150 kb/s, now it is around 2200-3000 kb/s.
i bought this new card and was happy that i have a fast card now and that the transferring data with usb connection would be faster, but it is not.
The writing speed is between 3-5 MB/s, not better then my old Sandisk 16gb class2 card.
I have aMAGLDR v1.13 with CWM v.5.0.2.7.
I use the usb mount from CWM and transfer data through it, but it is really a disappointment. I format the card through different ways, all without any success.
On the my computer the card is not faster with FAT32 (with the micro sd adapter), when i format the card to NTFS it is really fast, but i can not use it on my phone with NTFS. Is Fat32 the problem here?
Does someone have the same card and could approve this problems or am i the only one?
thanks in advance /masteroe
try this..
get into android and see if this app works...it will increase the cache...you should see difference..
thanks, i tried this already without any success.
it seems that the problem is not this value. In the CWM this value is not interesting at all.
As i told you on Windows i have same performance issues with FAT32....
If you bought your SD card from Ebay you probably bought a fake Class 10
domimatik said:
If you bought your SD card from Ebay you probably bought a fake Class 10
Click to expand...
Click to collapse
it is not from the bay it is a original card (i hope) from amazon.
Class 10 only assures you of 10MB/S on sequential write, so if the card has been written to a few times there could be some drop due to fragmentation. Also, there are various overheads to consider, moving the data about, issuing the write command to each block, wait for a confirmed write response, blahblah.
Here
http://www.smxrtos.com/articles/whiteppr/flashperformance.htm
Is a (very) technical explanation, which rather happily (or not) examines a 10MB/S raw write speed SD as an example (scroll way down) and calculates an actual write speed at 5MB/S.
samsamuel said:
Class 10 only assures you of 10MB/S on sequential write, so if the card has been written to a few times there could be some drop due to fragmentation. Also, there are various overheads to consider, moving the data about, issuing the write command to each block, wait for a confirmed write response, blahblah.
Here
http://www.smxrtos.com/articles/whiteppr/flashperformance.htm
Is a (very) technical explanation, which rather happily (or not) examines a 10MB/S raw write speed SD as an example (scroll way down) and calculates an actual write speed at 5MB/S.
Click to expand...
Click to collapse
thanks for your information, but i think there is an other problem, my class 2 card is faster as it seems . I'm copying 700 MB with 1,5MB at the moment, that is really frustrating....
hehe yea i know what you mean, mine always runs far slower than it probably should too, one point some meg/s, for both my class 2 and a class 6, never any faster, either through cwm, android usb mass storage, or my card reader. (Lots of built in card readers are just usb readers mounted to internal usb headers, and are often only usb1, which doesn't help, , usb has a lot of overhead, lots of info regarding usb overhead here http://www.smxrtos.com/articles/usb_art/usbperf.htm (if a little old))
i will give back the card. This card does not make sense with HTC HD2..
Thread can be closed ! Thanks anyway ..
Hello All,
I know there are lots of threads here about which SD cards work with the Defy, and which don't... E.g.:
[/showthread.php?t=1159877]
[/showthread.php?t=1660621]
[/showthread.php?t=1495446]
However, as an experienced computer hardware tech, it all seems very back-to-front to me. When you buy a new PC motherboard, the manual invariably tells you what memory type it requires, what speeds it can handle, and what its maximum memory data transfer rate is. Then, you can simply go out and buy the fastest memory the motherboard supports, and be fairly sure of two things: 1: it's going to work, and 2: you'll have the fastest memory speed you can get out of the motherboard, without wasting money buying faster memory than it can utilise.
For those who don't really understand these things, every motherboard, every CPU, every memory controller and every memory module has a maximum rated speed [over-clocking not included!] at which it is 'guaranteed' to work and be reliable. If your motherboard/CPU/memory controller has a maximum rated 800MHz memory transfer rate, there is no point installing 1333Mhz memory in that motherboard, because the motherboard will only run it at 800MHz. You'll pay more, for no speed or reliability advantage. In fact, as this forum shows, there is a VERY GOOD chance that you'll end up with something that is less reliable. This is because, as chip speeds increase, of necessity, certain timings and timing relationships change. For example, "Data Hold" times may [probably will] decrease, meaning that when reading data back from a faster memory chip, the data is starting to "disappear" from the output pin, before the CPU has had time to properly read it. The data transfer becomes "marginal", meaning it only just works, or doesn't quite. This will result in memory read errors (which will look like data corruption, even though the data inside the chip is perfectly correct), and will result in many of the problems described in these various threads. It will probably vary, depending on temperature, supply voltage, and type of data transfer (e.g. Photo/Video/USB, etc) and even phone - I.e. One Defy might work, the next might not - or your system (PC, phone, etc) may work for some things but not others, or work when it's cool, but bomb out as it gets hot, or vice versa. Instability and Unreliability are the keywords!
This, I submit, is why many people with Class 10 SD cards report problems. They would, I believe, be far better to buy Class 6, and are probably living under the illusion that a Class 10 card will work faster. I would say, it almost certainly won't...
Anyway, my point is, why do phone makers (or Motorola at least as I haven't really looked at other manufacturers) not publish their phone SD Card slot specifications? I just don't understand why not. It seems so fundamental to me.
If they did, you (everyone) would know what card Class to get, and be confident that it should work, and that if it doesn't, you've got a dodgy card. We wouldn't need long threads on XDA Developers discussing which cards work, and which don't.
So, my Defy came (OEM) with an unbranded 2GB micro SDHC card, with no visible Class mark. I wanted to upgrade, so I searched the Motorola Manuals for the SD Card slot spec, to find out what Class I needed. AMAZING, but No Luck! I couldn't find it anywhere.
So I looked at a cellphone accessory suppliers website, to see what they offered.
Url [not allowed]
Nearly all cards listed for the Defy are Class 4, so I figured the Defy must have a Class 4 slot.
I bought a 32GB Class 4 ADATA micro SDHC card, locally. It worked, no problems. I have tested it fairly thoroughly, copied a couple of GB of data to it (over USB) and done a bitwise comparison of the data. No problems. I have taken and viewed photos and movies, and seen no problems. I also tested the memory speed (using SD Tools from Google Play). It gives Write speeds of around 6MB/s and Read around 15MB/s.
However, while I was there, I spied a clearance priced 4GB Class 6 card, so bought that too. (Also ADATA.) Haven't tested that so much, but did run the same speed test in the same Defy phone. Was disappointed to find that the Write Speed is over 9MB/s (though Read is still around 14-15MB/s.)
From this, I conclude that the correct speed Class for the Motorola Defy SD card slot is actually Class 6 (and that I should have bought a Class 6 card... )
Can anyone tell me whether this is correct, and where, if anywhere, the actual manufacturer's SD card slot spec's are published?
BTW, the original 2GB card looks, from SD Tools, to be a Class 4 card, though oddly, the speed seems to vary a lot with that card. It sometimes, at the start of the test, goes as high as 10MB/s, but usually stabilises and ends at about 5.6MB/s (Write speed).
Also, can anyone with a Class 10 card (that works) in their (Original model) Motorola Defy please report here what data Write and Read speeds SD Tools reports? I think everyone with a Defy who wants to upgrade their memory would be very interested to know!
I think it would be great to finally nail this issue down.
Regards,
D2