Develop Bugs

[Q] Class 6 Ridata Lightning SLOOOW PC speeds

Well, I just bought an 8 Gig Class 6 Ridata Lightning microsdhc card...that got pretty good reviews, actually... and which also tests out to be a Class 6 card on SD Card Speed Test. The huge problem, for me, is that when I plug the card into my card reader on my pc, which is rather new..., I get TERRIBLE transfer speeds...even slower than any Class 2 that I've used. Any ideas? Should I request a replacement even though it's testing out as a Class 6? Is it my card reader? Is there any requirement for an internal card reader to read sdhc cards? Anyone with any insight would be very much appreciated. Thanks!

jreed3786 said:
Well, I just bought an 8 Gig Class 6 Ridata Lightning microsdhc card...that got pretty good reviews, actually... and which also tests out to be a Class 6 card on SD Card Speed Test. The huge problem, for me, is that when I plug the card into my card reader on my pc, which is rather new..., I get TERRIBLE transfer speeds...even slower than any Class 2 that I've used. Any ideas? Should I request a replacement even though it's testing out as a Class 6? Is it my card reader? Is there any requirement for an internal card reader to read sdhc cards? Anyone with any insight would be very much appreciated. Thanks!
Click to expand...
Click to collapse
It might be your card reader/computer. On my Class 4 I get speeds that surpass the transfer regular speed. If you have a sd card reader in your laptop/desktop try updating the drivers. If the reader goes into the usb slot, then get a new reader, or try out a different computer...This will help isolate the problem and your headaches.

Thanks, bro...
Ace42 said:
It might be your card reader/computer. On my Class 4 I get speeds that surpass the transfer regular speed. If you have a sd card reader in your laptop/desktop try updating the drivers. If the reader goes into the usb slot, then get a new reader, or try out a different computer...This will help isolate the problem and your headaches.
Click to expand...
Click to collapse
Yeah, thanks, I'll try finding drivers for it, there's an ! in device manager under USB...so I'll try to get it to recognize the hub drivers.

microsd samsung 32 gb class 10 lag and problems

hi, i'm using the latest firmware 4.0.2.A.0.58 firmware and I have a problem.
When I insert my 32gb microsd the phone become laggy and it seems freezed.
I tried the card on the pc, did a surface test, and it is perfect.
When I unmount the card the phone works properly.
If i use another 16gb microsd the phone still working properly.
So..what's the matter?does anyone noticed the same issue?
thank you!

No, mine works fine
Check my sig for more info on my sd and setup
Sent from my LT15i using XDA Premium App

It takes a time for phone to read out and sync media player if you got lot of music, videos, picture games etc.
Sent from my LT15i using XDA Premium

loryb84 said:
hi, i'm using the latest firmware 4.0.2.A.0.58 firmware and I have a problem.
When I insert my 32gb microsd the phone become laggy and it seems freezed.
I tried the card on the pc, did a surface test, and it is perfect.
When I unmount the card the phone works properly.
If i use another 16gb microsd the phone still working properly.
So..what's the matter?does anyone noticed the same issue?
thank you!
Click to expand...
Click to collapse
may be your memory card carry viruses so try to format it and then format your cell phone also(reset configuration with erase memory card)....may be this could solve your problem...

I see that you guys all use a class 10 card. Is there really a big difference compared to lower class cards?
My phone worked smooth enough with the stock 8GB class 2 card, and my current Transcend class 4 16GB doesn't harm the phone's performance.

class 4 is enough, on phone you will not see any DIFRENCE.
When you connect your phone to PC over USB and conect it to mass storage, you will see then POWER OF CLASS 10. faster uploading to PC, and faster dowloading from PC.
On phone class 10 and class 4 are the SAME.

Well, I noticed a difference and prefer the class 10 all the way.
Sent from my iPad 2 using Tapatalk

Hi hi Ok I have a problem and hoping someone can help...
I purchaced a kingston 32GB class 10 memory card and plagued with issues since having it.
My setup is...
Arc LT15
.42 Firmware
Advanced stock kernel
32GB class 10 memory card
Now the problem is images and videos and apps.
Apps...
They keep ramdom uninstalling if they are stored on the memory card
Videos/pictures
Any I have taken since installing the card become corrupted. Even screenshots.
IE I took a screenshot and it displayed on the phone, I went to gallary and viewed it fine.
Came to home screen and back to gallery still fine.
Left some time went to gallary and corrupt.
Cannot be viewed even by PC
This also happened to videos.
I had this problem so installed a totally fresh se rom updated via SEUS (I think)
Cleared dalvik cache and user cache etc manually installed the apps from the card etc etc used no backups apart from contacts backup
Everything was totally clean.
Even my language from swiftkey keyboard app keeps deleting randomly :/
Still getting the issue :/ Is there anything i'm missing?
Thanks,
Jinx13

Hey guys... read cearfully!
The class 10 approx parameters are... Read- 22 mb/s write 10 mb/s
The class 4 are Read 10 mb/s Write 4 mb/s...
So why your phones working bad with class 10?
Because those are linear read-write speeds...and you are using it only while USB connection by moovie transfer or watching... What is the rest card usage?
It is random read-write or seqental read-write used by yor apk's or fo example thumbs of stock gallery.
These speeds are for class 10 - 0.08 mb/s
class 4 - 0.8 mb/s
See the difference now? So class 10 is good for DSLR cameras or mediaplayers etc. Class 4 perfect for phone. Mine 32gb class 4 just flying!!!!!

So your saying 32GB class 10 is not supported fully by the ARC?
Jinx13

I don't get you.
SD speedtest apps give me ~10MB/s write and 20+MB/s read, so it's supported.
Also it feels faster than a class 4 (class 4 vs class 10 was tested in my X10, but Arc is even faster)
Sent from my LT15i using XDA Premium App

It is linear speeds...like you are reading or writing moovie or some one solid big file...
But the system uses random read of small files... And there class 10 looses. On class 4 compared to class 10 in gallery 1000+ photo thumbnails appears in seconds.
Try crystall disc mark software to test your card on PC and you will see. Test config is 5 tests at 100mb...pay attention at 4K and 4Kq32 speeds. At class 10 they are 0.04-0.08...

Ah
Anyways, I'm happy with my 32GB class 10
Sent from my LT15i using XDA Premium App

Ofcourse you are! I just wanted to make it clear for those who says that it is lagy or like that...

But it isn't laggy with the class 10 when you have a good sd card.
The cheap Kingston 16GB class 10 from eBay lagged often in Astro, but no problems with my Patriot 32GB class 10 sd card
Sent from my iPad 2 using Tapatalk

So can anyone explain why I might have problems?
From my previous post I just rebooted my phone and lost my SD apps AGAIN!!

Yep! Patriot is one of that card of class 10 that gives you a great performance in any type of R/W. There is a post here, on XDA...there said that patriot is the best card, so my answer is not for you man)))))
About sd apps loss you shold check your app wich provides managment of apps to sd card - links2sd or what it is... the promlem is not in the card.

Or check the sd if it corrupts files.
Sent from my iPad 2 using Tapatalk

ishishkin said:
Yep! Patriot is one of that card of class 10 that gives you a great performance in any type of R/W. There is a post here, on XDA...there said that patriot is the best card, so my answer is not for you man)))))
About sd apps loss you shold check your app wich provides managment of apps to sd card - links2sd or what it is... the promlem is not in the card.
Click to expand...
Click to collapse
It is not that program as that program just points to the settings page to move the file.
I have decided to put my 8GB class 2 back in and that is working without problems.
Flo95 said:
Or check the sd if it corrupts files.
Sent from my iPad 2 using Tapatalk
Click to expand...
Click to collapse
Yes it corrupts the images and videos from gallary
After testing with my old card since yesterday I will try send my card back.
Thanks for replies,
Jinx13

I bought a Kingston 16GB class 10 - Full of problems (returned)
Then a Kingston 32GB class 4 - better results but not that speedy
Now I found for 46euros here in Greece a Samsung 32GB class 10 so I said I have to try this.. and voila! The card is perfect, no lags! The phone is super speedy now!
So I guess it have to do with the cards not the brand.. if you re lucky you will end up with a good card.

[Q] SD-card issue

I bought a new Sandisk Micro SDHC 32GB UHS1 to increase a write/read speed to/from sd-card. But the problem is the sd-card steadily unmounted when I listen to the music or watch the movies. I think it‘s because of the class of the sd-card.
Can anyone confirm that this doesn‘t happen with the other class of the sd-card (with the same capacity of 32GB)?
I‘ll be very grateful for this.
Sent from my LG-P936 using xda premium

i have a Sandisk card but mine is only 8gb
it just works fine .
==== OFF TOPIC =====
i'v sent you a PM wich i'm not sure you got !
but please consider helping me on this :
http://forum.xda-developers.com/showpost.php?p=25363995&postcount=54
==================

Machzelet said:
I bought a new Sandisk Micro SDHC 32GB UHS1 to increase a write/read speed to/from sd-card. But the problem is the sd-card steadily unmounted when I listen to the music or watch the movies. I think it‘s because of the class of the sd-card.
Can anyone confirm that this doesn‘t happen with the other class of the sd-card (with the same capacity of 32GB)?
I‘ll be very grateful for this.
Sent from my LG-P936 using xda premium
Click to expand...
Click to collapse
I have a 32gb class 4 SanDisk MicroSD HC card, and I've actually never had any card issues at all, ie unmounting, corrupting, or anything weird. I've seen higher class 32gb cards, but I know how rare it is to have a microSD that doesn't ever give you any problems, so I'm sticking with my slower class 4 that has never let me down since I started using it about 5 months ago.

Well, I found the problem. Our devices are compatible only with microSD cards that have 2.0 interface like classes 2-10. UHS1 cards have a new 3.01 interface, therefore our devices don‘t support the new interface.
Sent from my LG-P936 using xda premium

Machzelet said:
Well, I found the problem. Our devices are compatible only with microSD cards that have 2.0 interface like classes 2-10. UHS1 cards have a new 3.01 interface, therefore our devices don‘t support the new interface.
Click to expand...
Click to collapse
It's supposed to be backward compatible, but I guess things don't always work how they are supposed to.

drumist said:
It's supposed to be backward compatible...
Click to expand...
Click to collapse
I agree. With my Sandisk 32gb (Class 4), I formatted it as FAT32 with 64kb clusters from a card-reader on my PC.
I had unmounting issues as well, but I believe I incorrectly disabled something when I was debloating my Nitro...Once I started using CM9 though, the unmounting issues went away.
* If your Nitro is stock, then I would suggest trying to format your card from a PC and trying again.
* If you're rooted, stock rom and did some debloating yourself...Try getting your phone back to stock and see if you still have issues
* If you're rooted and would like to try a new ROM, definitely try CM9, that will take care of the bloat and potentially the unmounting issues.

Hmmmm I just bought a UHS-1 card, haven't opened it yet. Is this phone for sure unable to take advantage of it?

Machzelet said:
I bought a new Sandisk Micro SDHC 32GB UHS1 to increase a write/read speed to/from sd-card. But the problem is the sd-card steadily unmounted when I listen to the music or watch the movies. I think it‘s because of the class of the sd-card.
Can anyone confirm that this doesn‘t happen with the other class of the sd-card (with the same capacity of 32GB)?
I‘ll be very grateful for this.
Sent from my LG-P936 using xda premium
Click to expand...
Click to collapse
Try heading to http://www.sdcard.org and download the SD Card formatter. Format the card and see if it makes a difference (Needs to be done from a Laptop/PC). I know I had to do this with one of my external SD Cards and it started working again, but I did not have the same problem as you.

slow coping speed of memory card....

i have a memory can of scandisk 16gb(class don't known)before this i have 8gb,4gb...
i used this on my evo 3d..
when i try to copy any item from laptop to this 16gb memory card it give max. speed 3.0--3.14 mb per second with using datacable or adaptor but if i try 8gb card now max. speed goes to 7mb(aprox.) ..also if i try to copy any item from memory card to laptop when speed goes near about 22 mb per sec. in both memory cards..
i can try this on many computer also but samething happen...
now what can i do ????

simran420 said:
i have a memory can of scandisk 16gb(class don't known)before this i have 8gb,4gb...
i used this on my evo 3d..
when i try to copy any item from laptop to this 16gb memory card it give max. speed 3.0--3.14 mb per second with using datacable or adaptor but if i try 8gb card now max. speed goes to 7mb(aprox.) ..also if i try to copy any item from memory card to laptop when speed goes near about 22 mb per sec. in both memory cards..
i can try this on many computer also but samething happen...
now what can i do ????
Click to expand...
Click to collapse
Compare the class of both cards, the card with higher class should be faster.
Another question may be if you are using the same usb port. Maybe one port is a 1.0 and the other 2.0.
Another reason may be the adaptor you are using for reading/writing, if you are using diferent adaptors maybe one of them is a 1.0 usb.

how can i find the class of sd cards...
i try this on all usb ports but samething happen ..
i have only one adopter...

I would guess it's the card's speed - it's normal for the "read" speed to be faster than the "write" speed.
The speeds you're getting sound like the card is probably a Class 4 - whereas the other ones that write faster have a higher speed.

Just look at the card, it has either a 2 or a 4 or a 6 in a circle stamped on it. Thats the class. The class = the number of MB/S it can transfer. A class 6, for example, transfers approximately 6mb / sec.

I also on my Wave 3 I have a microSD 8 GB Class 4, and is very slow
The games installed on the extern memory are hard to play... bah

Hey guys don't go for SanDisk. Its crap.i have blown my 32gb clsss 10 card and facing really problem for replacement. The support system is very weak.better go for some others.
Sent from my MT11i

XDguru said:
Hey guys don't go for SanDisk. Its crap.i have blown my 32gb clsss 10 card and facing really problem for replacement. The support system is very weak.better go for some others.
Sent from my MT11i
Click to expand...
Click to collapse
samsung is a good option
sony though a bit costly lasts longer than any other cards.

I'll try it
---------- Post added at 09:30 AM ---------- Previous post was at 09:25 AM ----------
I'm waiting until I get a 32GB SD card I ordered in Dealxtreme. I remember it was a class 4. I'll tell you.

[Q] MicroSD card speed limitation in Galaxy Note 2

I have just bought a SanDisk Ultra microSDHC 32GB UHS-1, but I noticed the transfer speed seems to be rather slow. So installed the SD Card Tester tool and run a test. On average, the writing speed is about 8 MB/s and reading speed is about 11.5 MB/s this is no where near the 30 MB/s speed mentioned for a UHS-1 card.
I also have a 2 GB microSD card of unknown brand (made in China) that I got for free when I bought my Blackberry Gemini. Surprisingly the test result is slightly better, writing speed is 9.97 MB/s and reading speed 12.21 MB/s.
I bought the SanDisk microSD card at a major computer store, so I believe the card is genuine.
My question is, is there any speed limitation on Galaxy Note 2 hardware for reading/writing to a microSD card to an extent that buying a class 10 or UHS-1 card is pretty much useless?

have you tried speed testing both on pc ??

devil_slayer said:
have you tried speed testing both on pc ??
Click to expand...
Click to collapse
Not yet, my PC is really old does not have a card reader slot. I will need to get one external card reader.

With a class 10 card I get 15 Mb/s write and 33 Mb/s read.
Sent from my GT-N7100 using xda app-developers app

Hielko said:
With a class 10 card I get 15 Mb/s write and 33 Mb/s read.
Sent from my GT-N7100 using xda app-developers app
Click to expand...
Click to collapse
which card brand and model?
what tool did you use to test the speed?
was the card formatted in Android or Windows?

A1 sd bench
dvn2008 said:
which card brand and model?
what tool did you use to test the speed?
was the card formatted in Android or Windows?
Click to expand...
Click to collapse
Try using A1 sd bench, from play store.
I get better better speeds using that with the same cardas you.

Transcend 16 gb.
Tested with the same tool as you used.
Formatted with android as I remember well.
Sent from my GT-N7100 using xda app-developers app