USB transfer speed - HD2 Android Q&A, Help & Troubleshooting and Genera

I'm using the:
MDJs_CyanogenMod7_v.2.3_NAND_A2SD+
And a 8gig class-4 SD
When transferring files of 1-2gig the transfer rate drops to
around 800Kb/sec. So a 1 gig file takes up to 20min.
On the stock WinMo 6.5 it goes 5 times faster.
What can i do to speed this up?
1) Does a different android rom help?
2) Revert back to Android SD instead of NAND?
3) Can i do something on the PC to speed things up?

transfers significantly faster with mac
I have noticed that Mac computers transfer files to the external sd card on Andriod phones significantly faster.
1GB transfer on Windows machine takes about 30 min and the same transfer with a Mac is about 5 min. Both are with the external SD card mounted as a drive. The SD card is a class 10 32 GB. The phone is a Samsung S2.
What gives? Does anyone have an idea why this is happening?
Does anyone have a suggestion on what I can do to speed up the Windows transfers?

Yea, i noticed, with my phone at least, that file transfers usually go a lot slower when Smaller files are being transferred as oppressed to big ones.
In my card reader, it would go about 800k for a large group of 10kb and shoot up to 8-9mb. On my phone, the fastest i remembered it going was about 6-8mb/s. Try reformatting changing allocation unit size to 32k. The only problem is that it will waste like 20mb (guessing) by the time its filed up. Its feels it bit faster but i don't really notice most of the time.
If you do it, don't forget to back up!

Related

ActiveSync SLOOOOOW!!!

Why is copying files through activesync so slow compared to copying files onto my SD card through a USB SD Card Reader?
I suspect it has something to do with USB 1.1 and USB 2.0, but the difference is HUGE!!
100MB File
ActiveSync - 1hr 30mins!!
SD Card Reader - 15 seconds!!
Anyone know why?
prob
1 because of usb1.1 vs. 2
2 maybe because all cominication goes across the cpu's interface and never have direct access to the memory like a sdcard reader does
I think you're right about going through the CPU interface, however,
1 hr 30 min vs 15 sec = 160 times difference!!! Incredible.

Q-TEC 9000 with Transcend 4GB SD slow transfer

Can anybody tell me how I can fix my transfer speed with ActifSync 4.0.
Because if I upload the transfer rate is about 100 kb/s.
Anyone with the same phone and sd-card please help me.
Thanks
Ercan
Holland/Turkey
If you want faster transfer speeds use a card reader. Using activesync the data first gets moved to the universal, then from the universal to the memory card. This is very slow due to the limited bus speed of the universal.
But with my 512 mb card, I get normal speed. I think you dont understand how slow it is. Let me explane.
512 mb > 3 sec 1 song
4 gb > 30 sec 1 song
Yesterday I bought a Transcend 4GB 150x SD card.
It's very slow; not only when using it in my HTC Universal, but also in the cardreader in my PC.
I'm going to return it tomorrow...
Jan after reading some reviews they say that it is one of the fastest cards. I think the problem is with the reader. I can now transfer at usb 1.0 speed with Card Export II.
Are there any app. with 2.0 support?

MicroSD card performance

I've noticed that copying files to the phone (to storage card) via USB cable is painfully slow (as compared to say regular USB stick).
Would purchasing a high speed MicroSD (e.g. Sandisk Premier) help or is the phone itself the bottleneck?
Thanks!
Try connecting your phone as a mass storage device, if you haven't done that already.
You can select this when you plug in the usb cable.
Accessing the storage card is way faster then.
milan_ns said:
I've noticed that copying files to the phone (to storage card) via USB cable is painfully slow (as compared to say regular USB stick).
Would purchasing a high speed MicroSD (e.g. Sandisk Premier) help or is the phone itself the bottleneck?
Thanks!
Click to expand...
Click to collapse
I have purchased SanDisk Mobile Ultra (Class 6) and the performance increase in real terms is marginal!
milan_ns said:
I've noticed that copying files to the phone (to storage card) via USB cable is painfully slow (as compared to say regular USB stick).
Would purchasing a high speed MicroSD (e.g. Sandisk Premier) help or is the phone itself the bottleneck?
Thanks!
Click to expand...
Click to collapse
It would certainly help. Also search this forum for tnyynt's SD Tuneup cab. Note that installing that cab only makes much of a difference once you got a faster SD.
The transfer speed of the SD is limited for whatever reason, power preservation, whatever, it's limited to optimize for slower SD cards. So The SDTuneup cab ups this limit, meaning you will notice a much bigger speed difference when using faster SD cards.
i also find the msd card speed poor. especially when you open up a folder with a lot of images every image software takes minutes to scan the folder.
that is very lame

HD2 USB transfer speeds?

I've looked everywhere. No one seems to have posted them. What are they?
Right now I'm a bit confused. Since this is an awesome device you'd think it would be fast in every aspect. It is, except for USB file transfers.
I'm running on Windows 7 Ultimate. I backed up everything from my phone to the computer with a data transfer rate from the SD card, in the phone, of 4.5MB/s. I then formatted the card (read earlier that this would help with the HD2 lock-ups) and copied everything back onto the SD card in the same fashion, through the phone. The data transfer back is right around 2.5 MB/s.... ???
I've tested all the ports around the computer, each are about the same. Anyone have any idea on how to fix this?
First thing would be to tell what kind and class of microSD card you have...
That would really depend on your SD card "class".
The higher the class, the faster it is capable of performing reading and writing operations.
But it's better to avoid the 16GB cards... the larger capacity cards take much longer to read... regardless of classifications or brand.
Something like a 4GB - Class 6 card is excellent.
I've read that it's only a class 2 MicroSD. Do you guys know where I can get class 4, or even a class 6 MicroSD? Whichever I get however depends on the max speed of the HD2. For example, I don't want to buy a class 6 and find out that the HD2 can only handle speeds up to the class 4. There is a $30-$40 USD difference.
Thanks for the SD info, it definitely helps. But now we're brought back to my original question. What are the max transfer speeds through the phone onto/from the MicroSD card? Has anyone found out?
personally i wouldn't do large data backups through activesync/MDC with the card still in the phone.
its simple to remove the card and put it in the supplied adapter card for use with sd_readers.
i bought a usb1.1 reader from a 'pound' shop, copying large files takes alot less time (average 10-11mb/sec) with my more expensive usb2.0 reader its even faster (average 50-60mb/sec)
card class does make a difference, but then so does sending large amounts of data through a 'middle man' like activesync or device center.
budget SD reader FTW
That is a good point, and I agree is faster than through the phone. For me though I have a few accessories on the phone which make taking the SD card out quite a pain.
I have an invisishield on the screen, and a poly-something or other high density plastic cover to replace the cover that came with the phone,-- It grips around the HD2 tightly. The cover is wonderful, but it tends to interfere with the invisishield. So if I am continually taking the cover on and off to get the SD card out I will eventually bend up the edges of the invisishield and will need to get that replaced.
In my best attempts to keep the phone nice I'm going to have to stick with whatever input/output the HD2-to/from-SD can give me.
choosing disk drive mode rather than active sync is the easiest way to speed up file transfers.
re: the figures you gave in post 1, write is always slower than read.
Forgot to mention, it was in 'disk drive mode'.
Btw, I found that the HTC HD2 is USB 2.0 Hi-Speed capable out-of-box. (I'd post a link, but forums wont let me, being new), and Hi-Speed USB can transfer 480Mbits/s, or ~57MB/s (Wikipedia, Universal Serial Bus, Signaling).
The Class 6 MicroSD card can write 48Mbits/s, or 6MB/s (Wikipedia, Secure Digital, Speeds). Easily obtained for the HD2.
Assuming this is everything that needs to be dealt with, this should work out wonderfully. I'll be writing files 300% faster with a class 6, and reading a whole lot faster (thanks Samsamuel, forgot about that read/write differences). Question is though, is this all? Or do I need to install some hi-speed usb driver on the computer? Or are there other things I'm not seeing that need to be dealt with?
its also worth remembering when you are doing the maths that USB loses around 25/35% to networking overhead. (the data that makes up the packet that holds the data you are transferring)
So, 480 Mbit = 60MBytes total = around 35Mbytes actual data transferred per second. (Results vary depending on the system, the cable, all kinds of things, but 30-35 is average, a little more in a testbed situation.
So I guess I'll just have to suffer with 219% faster instead of 300%... Well, looks like I'm returning the HD2!

[Q] Slow Android USB-Masstorage connection

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.

Categories

Resources