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sdhc 8 gb slow write speed

Hi all,
I have a SDHC 8gb (Class 4). I tested its speed with J-benchmark. Frequent test shows that the write speed of this SD isn't any better than class 2 sd card i used before(4 gb).
I usually get write speed of 1.5mb/s and read speed of 2.5mb/s. Today I decided to change the buffer size to 8kb and got 4mb/s write speed. This is what a class 4 card should normally hit right?
So, I'd like to know if there's any way i can increase the buffer speed while transfering files from my PC. I'm really having a hard time copying movie files to my sd card. Files transfer of larger than 100mb take ages and even get disrupted at times.
Thanks for the help!!!

pradeepkc said:
Hi all,
I have a SDHC 8gb (Class 4). I tested its speed with J-benchmark. Frequent test shows that the write speed of this SD isn't any better than class 2 sd card i used before(4 gb).
I usually get write speed of 1.5mb/s and read speed of 2.5mb/s. Today I decided to change the buffer size to 8kb and got 4mb/s write speed. This is what a class 4 card should normally hit right?
So, I'd like to know if there's any way i can increase the buffer speed while transfering files from my PC. I'm really having a hard time copying movie files to my sd card. Files transfer of larger than 100mb take ages and even get disrupted at times.
Thanks for the help!!!
Click to expand...
Click to collapse
Random no-name brand? No surprise.. Lots of cheap, slow, unstable storage cards out there these days.
J-Benchmark isn't of much use if you don't know what the real workd transfer speed is, so you might want to try testing it against the computer... Send a large file, time it, see how long before you can safely remove the device.

khaytsus said:
Random no-name brand? No surprise.. Lots of cheap, slow, unstable storage cards out there these days.
J-Benchmark isn't of much use if you don't know what the real workd transfer speed is, so you might want to try testing it against the computer... Send a large file, time it, see how long before you can safely remove the device.
Click to expand...
Click to collapse
well, it says transcend but i'm doubtful. Bought it at very cheap price from a wholesale market.
But there's something I've noticed, the transfer speed is slow through usb only...if i unmount the card and use it through a normal card reader its quite fast...I tried sending a 800mb movie file and it took just above 4 mins....
So, I don't think its the card that's the culprit. puzzled!!! could it be the rom i'm using or froyo itself?

I'm sorry that I can't be of any help, but i got the exact same problem. Bought a 16gb card, kingston brand, class4 (don't expect that much of it, but the stock was class 2, so i figured that it would be ok..)
I get horrible write speed, around 200-250 kb/s (or whatever it's called). Don't remember what the old one did, but it wasn't that bad.
I've plugged the card directly into the PC, and it gets much higher speeds..
Exactly the same problem, as u guys..
Come on, an hour to copy a movie to the phone, that's just not acceptable!
PS: have you tried this?
Mine was allready at 128, but it's probably worth a shot..
http://forum.xda-developers.com/showthread.php?t=921530
Hope anyone has some solutions to this, it's just seriously annoying
Oh, and i've got the desire with cm7 on it, it's not that different from the n1..

It's the phone not the cards. It just doesn't appear able to acheive transfer speeds higher than you'd get with a Class 2 SD card.

In the link i posted, there was a guy who found out a way around the limits of android on a EVO 4g device. I was hoping for a similar fix.. Or just something

Bought a Class 10 Kingmax and disappointed that write speeds are still maxing at 1.5 MBps Waste of money
2.5Mbps in recovery.
SOOOOOO SLOW copying videos over yaaawn.
Using a card reader means switching off the phone, which is not really an option IMHO.

You can benefit from the faster rated cards if you use a card reader, and even better if you buy a second card so that you can load up one while using the other. Quick swap, job done!

I have a Transcent 8GB class 6. I get speeds from 6mb/s-8mb/s.

SDCard Transfer Speeds

Picked up a Patriot 16 GB card (class 4) and while I know its a class 4, it seems the transfer speeds are fairly slow. Unfortunately I'm in XP so its not telling me what the transfer speed is.
I first put the card in the N1 and let it format it. I then tried to bring over all the data on my old card and it was super slow (like 50kb a sec-was at home and Vista so it told me). Now I'm at work and this time it brought over all my old data more quickly but it still seems slowish (Gonna copy over a couple GB of music today).
Do they just have this slow transfer speeds? Its cool if thats the way it is, I don't mess with SDCards so don't have any experience with them.
Right now I'm bringing over a little over 500 MBs and it looks like its gonna be 30 mins for it to do it at least. The mins remaining is all over the place.
Also, the phone formatted the card in fat32.
I tried the SD Card Formatter download I've seen mentioned on here but it wouldn't install for me on my computer.

Use an sdcard reader. It will be much faster to transfer data.

Yup, faster transfer now.
I knew that but had a brain fart.

[Q] What is your int SD write speed?

My SGS was bought back in September. A new one (feb '11) was in my hands a few days before and I saw constant write speed of around 9 MB/s on internal SD. Mine usually does 6-7 MB/s. Are new ones faster?
No cache involved: big files and overall speed

Same 6-7 MB/s.
I think is a very normal speed.

Can anybody with a new one (January or newer) test it?
Connect as a Card Reader and transfer big files (500 MB should be fine)
If using Windows, wait for the transfer to complete in order to see the real speed

not a valid comparison.. empty file systems have higher speeds you need to have the same amount of crap on there.. even that may not do it depending on fragmentation.. really need to start empty on both and do tests.

[Q] Galaxy S card formatting settings

Hey, I just got an 8 GB microSD card for my Galaxy from my father (he was using it before giving it to me) and, instead of formatting it using the Galaxy, I formatted it in my computer and I am afraid that I might have done something wrong. The problem is that it's transfer rate is painfully slow (about 2 MBps, whereas my old 2 GB card would transfer files at 30 MBps).
Also, after formatting it using the computer, I formatted it again using the Galaxy, but still, the slow transfer rate remains. I don't think this is normal.
So, I want to try to format it again using the computer, but I need to know the exact settings for optimal performance. Quick format, the unit allocation size etc.
Can anybody help me with this?
Ah, I think is useful to mention that I'm currently running Darky's ROM 10.2 RE, with lagfix activated.

vladbaca said:
Hey, I just got an 8 GB microSD card for my Galaxy from my father (he was using it before giving it to me) and, instead of formatting it using the Galaxy, I formatted it in my computer and I am afraid that I might have done something wrong. The problem is that it's transfer rate is painfully slow (about 2 MBps, whereas my old 2 GB card would transfer files at 30 MBps).
Also, after formatting it using the computer, I formatted it again using the Galaxy, but still, the slow transfer rate remains. I don't think this is normal.
So, I want to try to format it again using the computer, but I need to know the exact settings for optimal performance. Quick format, the unit allocation size etc.
Can anybody help me with this?
Ah, I think is useful to mention that I'm currently running Darky's ROM 10.2 RE, with lagfix activated.
Click to expand...
Click to collapse
What make is it? And class?? The best ones are sandisk hc memory cards with optimum class of 2 or above, you'll find all this info on the memory card itself
Sent from my GT-I9000 using XDA Premium App

Well on the card, it says
MicroSD HC; there's also a 4 inscribed in a circle.
8 GB
C08G TAIWAN
Kingston
SDC4/8GB
So I guess it's a kingston hc card, but I'm not sure about the class.

SDC4/8GB = SD Class 4 8 GB.
normal transfer for it. Its 2-3 mbps

[Q] Milestone highest SD Class I can go with

I know it has been asked a lot in the past, but searching didn't provide Milestone specific answer.
So If I buy Class 6 or Class 10, will the milestone be able to utilize the full write speed? I am running Cyanogenmod 7 RC0 (latest). At the moment I have 8GB class 4 Apacer microSD and tbh its a terrible card. All I get is 2.5 mb/s write on large files, but I am getting the same speed when the card is in card reader too so its not phone issue.
Thanks.

Maybe I'm wrong, but what I know is that the card class is the limit. It doesn't mean it will read/write at full speed all the time.
How are you testing your speeds?
Maybe SD Speed Increase help you.
https://play.google.com/store/apps/...t=W251bGwsMSwxLDEsImNvbS5zZGluY3JlYXNlLml0Il0.
I don't know how to test my speeds, but were getting 24mb/s read and 8mb/s write speeds in SD Tools ( https://play.google.com/store/apps/...1bGwsMSwxLDEsImFsZXMudmVsdXNjZWsuc2R0b29scyJd ). I'm using a Samsung 16gb Class2. I think the app is not calculating very well. Don't know.

I am using the SD card as USB mass storage instead of carrying separate thumb drive. I transfer a lot of large 1+ GB files.
I tried SD Speed increase last week and it does make a difference on smaller files, but when copying 2GB files it seems to start fast (like a burst mode), but if timed it takes exactly the same time to write something on the card.
I am going to change my 8GB card for 16GB today anyway I just wondered if class 10 is worth getting or should I get class 6 and save some money. Whatever I buy I will report back and test the speed.

I went ahead and bought Patriot LX 16 GB class 10 microSD. Now I get variable speeds from 3.5 mb/s to 8 mb/s depending on the file sizes. As I read somewhere this is due to fact that the phone is using MTP protocol to act as mass storage device.
Anyway with the old card I was topping only 2.5 mb/s no matter the file size, so it's definitely an upgrade and since class 6 was only 5$ cheaper I saw no reason not to buy the faster one, even if the milestone can't utilize its full capability. In the end its an old phone and I believe there weren't any class 10 cards out in 2009 anyway.
And one more thing, the camcorder isnt lagging anymore when recording videos
EDIT: After booting in recovery and clearing dalvik and cache partition I am getting 9.5 + mb/s, but it does start around 4.5 mb/s and then rises to its full speed. Cheers.

Except for the improvements in video recording, is there anything else that runs smoother for you when using the phone?

maango said:
Except for the improvements in video recording, is there anything else that runs smoother for you when using the phone?
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I think everytime any app need to access your sd, it will be smoother, like gallery, taking photos, loading maps cached in sd, music apps indexing songs, etc. Accessing apps installed on sd card may be loaded faster too.

extrem0 said:
I think everytime any app need to access your sd, it will be smoother, like gallery, taking photos, loading maps cached in sd, music apps indexing songs, etc. Accessing apps installed on sd card may be loaded faster too.
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Click to collapse
Thats right. Gallery loads faster, applications and games moved to SD start up faster etc. Don't know about maps, but I suppose they cache faster too.
However the main difference is when copying stuff to phone in mass storage mode. Thats why I got a higher class card in first place. While all other stuff related to reading from SD do seem snappier, the difference is not all that great since even Class 2 cards can read with high speed, but when it comes to apps that are writing the difference is obvious.

I'm using a Samsung Essentials 32GB Class 10 Card.
Gave me some troubles at first, something with sector sizes seemed wrong - but after formatting it with this tool https://www.sdcard.org/downloads/formatter_3/ it worked.
Someone in these forums suggested the tools - search for the link to find the recommended settings.

Alright, thx for the answer. For someone not using the phone the same way as you, do you think it would be worth the money to get a faster card?
Sent from my Milestone using XDA

The difference between class 6 and class 10 right now is only few bucks. I don't see why not. You never know, may come in handy.
Here check this out, less then 1$ difference in price.
16GB microSDHC CARD Class 6 - Transcend
16GB microSDHC CARD Class 10 - Transcend
I wouldn't go below class 6 since the camera is lagging when recording videos.

Is it true that if a formatted microSD often will make it slow microSD?

It' unlikely, but possible.
My Samsung Essentials 32GB Class 10 card gave my Milestone hiccups at first (rebooted several times when powering on, rebooted every time I left USB mass storage mode) so I re-formatted it using these instructions: http://forum.xda-developers.com/showpost.php?p=23494134&postcount=7417
Now everything works fine and I still get a little more than 10MB/s when copying movies via USB - so no loss here.