Develop Bugs

[Q] SDcard, read "As Disk" real slow

Ive been connecting my Evo via USB and then selecting "As Disk Drive" to access my SD card on the phone via the computer. The read and write speeds are horrendous this way. Copying a few ~1GB files from the card to the computer im getting 1MB/s.
When i take the card out and put in it an full SD adapter and use a card reader im getting 10MB/s. Why am i seeing a 10x performance outside the phone? Any way to fix this.
PS, this is the stock 8GB microSD card.

I think it has to do with the limit the phone has for reading/writing speed. Like my phone has the same problem if I attempt to copy over 1gb worth of songs for example the wait time be around 23-30 minutes for some reason but soon as i put the sd in a cardreader and plug it into my computer i can tranfer the 1gb file in 2.5minutes.

Can anyone else confirm this is a limitation of the phone? Its a pain to get to the SD card in the Evo, id hate to have to open it every time i need to copy a few things.

I had a problem like this once and I changed kernels and it seemed to be normal again.
Sent from my PC36100 using XDA App

What kernel are u using now?
Sent from my PC36100 using XDA App

Try this:
http://forum.xda-developers.com/showthread.php?t=921530

cruise350 said:
Try this:
http://forum.xda-developers.com/showthread.php?t=921530
Click to expand...
Click to collapse
I read this, looks like a temp fix that has to be applied over and over after restarts. Any easy way to apply a permanent fix?

Was on a savagedzen went back to the cm7 that came with rom. It mayhave been fixed in newer versions but I'm sticking with cm7 stock. Could have also just been a fluke
Sent from my PC36100 using XDA App

So i checked with adb using the following command
Code:
adb shell cat /sys/devices/virtual/bdi/179:0/read_ahead_kb
and it came back 128...so im having this issue even when its set at 128, any suggestions?
Using SD card speed tester i am getting 2 write and 6 read using stock 8GB class 2. This is accurate, however when transferring from phone to computer it is peaking around 1MB/s. Idk where this limitation exists as sticking the card into a reader im getting 10MB/s.

class 10 you can set up to 1024.. ..there's a zip on another thread to have this set always.... even after reboot....
i'm class 10.. 16gb, and i'm running the sd card tweak at 1024... i'm writing at 11./read 16

External SD Card suddenly removed

I have a 32gb Sandisk sd Card class 10 installed on my Phone. I use it for keep my musics & videos.
Recently, I try to move my apps to the sd Card, but suddenly the Day After I move the apps, the sd Card is force removed by itself.
Therefore, my apps, musics & video, & other files cannot be opened. But After restart the Phone, the files Can be opened again.
How it could be?
Sent from my SPH-D710 using xda premium

Willya said:
I have a 32gb Sandisk sd Card class 10 installed on my Phone. I use it for keep my musics & videos.
Recently, I try to move my apps to the sd Card, but suddenly the Day After I move the apps, the sd Card is force removed by itself.
Therefore, my apps, musics & video, & other files cannot be opened. But After restart the Phone, the files Can be opened again.
How it could be?
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
What type of partition do you have your SD Card set up as? NTFS or FAT32?
What ROM are you on? are you on agat's new JB custom kernels?

g_ding84 said:
What type of partition do you have your SD Card set up as? NTFS or FAT32?
What ROM are you on? are you on agat's new JB custom kernels?
Click to expand...
Click to collapse
I think it's still default FAT32, I am using ICS FI03..
Sent from my SPH-D710 using xda premium

I had the EXACT same issue. Is it the one that is a UHS-1 class card with the grey and red coloring on one side? I thought it was my phone till i tried a different class 10 it (samsung and kingston) with no problems. Thats a sign of the card failing in the phone and you need to backup NOW! I ended up having to RMA the card to sandisk.

Came across this once on my wife's phone, I opened the back and took card out and did an old school Nintendo cartridge blow out and never had any issues after that.
Pp.
sent from a jellybean filled epic touch.

Micro SD Card mount problem

Hey folks, I have a bit of a problem here. I just recently started having this problem of my micro sd card not being able to be mounted to my GS3 for anything. I don't know what the problem is nor how it can be rectified? So it's known, I'm rooted with the latest CW recovery mod for JB fw version 4.2.1. I tried recovering to factory settings but that doesn't work because I have wiped all my caches. Any ideas as to what I can do to fix this issue? I have no problem losing full, permanent root access by the way but also keep in mind that I currently do not have a computer of any kind. I was able to gain permanent root access when I borrowed my buddy's laptop last week but gave his laptop back.
The message I always see on my phone when I go to manually mount my SD Card in Settings is ..."Your SD Card is ready to be removed."
- Bummed Out
= (
Sent from my SGH-T999 using xda app

spicy_puerto_rican said:
Hey folks, I have a bit of a problem here. I just recently started having this problem of my micro sd card not being able to be mounted to my GS3 for anything. I don't know what the problem is nor how it can be rectified? So it's known, I'm rooted with the latest CW recovery mod for JB fw version 4.2.1. I tried recovering to factory settings but that doesn't work because I have wiped all my caches. Any ideas as to what I can do to fix this issue? I have no problem losing full, permanent root access by the way but also keep in mind that I currently do not have a computer of any kind. I was able to gain permanent root access when I borrowed my buddy's laptop last week but gave his laptop back.
The message I always see on my phone when I go to manually mount my SD Card in Settings is ..."Your SD Card is ready to be removed."
- Bummed Out
= (
Sent from my SGH-T999 using xda app
Click to expand...
Click to collapse
Honestly, this sounds like your SD Card is in its last days, so to speak. This happens quite frequently and they just do not last forever.
What brand is it?
What is its class and size?
How old is it?
Where did you buy it?
If you boot into CWM, can you mount it there?
Your best bet is to try your best to get any important info off of it, then format it. If you have the space, copy everything important to your Internal SD, then format it through the settings menu. If that doesnt help, you will need to try again from a computer. Use the SD formatter tool from http://www.sdcard.org
I am assuming the card was working fine on your phone and this just started happening recently.
---------- Post added at 10:41 PM ---------- Previous post was at 10:40 PM ----------
Oh and for future threads, this shouldve gone in Q&A. If you dont see it here, then it will have been moved.

Please read forum rules before posting
Questions and help issues go in Q&A and help section
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The SD Card is a legit 64GB, Class 10, micro SD Card that I bought not even a year ago from Amazon for $55. It's the card that looks half red and hald grey. I had a ton of stuff on it too... movies, about 2k songs, tv show series, hundreds of pics, paid-for apps, emulated games and more. I think once I flashed a new different rom from the original regular CW 4.2.1, that's when my card was wiped clean. Now I can sometimes go to my sc card in the EZ Explorer Android app and it shows that my card has no files on it whatsoever.
Oh, I also get an error message of something like "cannot mount sd card... error." .... when I mount my card in the CW Recovery screen. I've also tried adding new files to the sd card and when I go back later that day or the next day, those files were wiped clean like they were never written to the card.
So now, the only place I can save files to is my internal phone memory.
So sad and blue...
= (
Sent from my SGH-T999 using xda app-developers app

spicy_puerto_rican said:
The SD Card is a legit 64GB, Class 10, micro SD Card that I bought not even a year ago from Amazon for $55. It's the card that looks half red and hald grey. I had a ton of stuff on it too... movies, about 2k songs, tv show series, hundreds of pics, paid-for apps, emulated games and more. I think once I flashed a new different rom from the original regular CW 4.2.1, that's when my card was wiped clean. Now I can sometimes go to my sc card in the EZ Explorer Android app and it shows that my card has no files on it whatsoever.
Oh, I also get an error message of something like "cannot mount sd card... error." .... when I mount my card in the CW Recovery screen. I've also tried adding new files to the sd card and when I go back later that day or the next day, those files were wiped clean like they were never written to the card.
So now, the only place I can save files to is my internal phone memory.
So sad and blue...
= (
Sent from my SGH-T999 using xda app-developers app
Click to expand...
Click to collapse
Yup, sounds like its on its way out. Unless you specifically tell cwm to do so, it doesn't touch your external sd. Some people have made the mistake and wiped out their data by not paying attention to what they're doing.
Anyway, there are data recovery tools you can try to use. Many people have had some success recovering info off of flash memory like that.
Sounds like it was a sandisk, but it should be clearly labelled as such. If its not its probably a knock off. Youd be surprised how many fakes are out there. Even highly reputable sellers have been known to sell cheap knock off sdcards. They don't do it on purpose of course, but I've even seen where they came from stores like Best Buy. The last time I looked I think Samsung, Kingston and Sandisk were the most popular targets for fake sdcard dealers.
This is why I only buy Samsung brand cards, and only from sellers who are Samsung Authorized Dealers. They buy direct from Samsung so you can be confident that you are getting a real one.
Even so, the best ones are still known to fail. I'd google for flash memory data recovery to see if you can rescue some stuff. And I would replace the card.
Its always a good idea to keep a backup even of your sd data. Sorry for your troubles.
Sent from my SGH-T999L using xda premium

Thanks man, you've been a tremendous help with this issue! I will try recovering my stuff on my card later using recovery software. Thanks a bunch!
= D
Sent from my SGH-T999 using xda app-developers app

And yes, it was clearly labeled as SanDisk too. But I, like you, have a feeling it's on its last leg.
Sent from my SGH-T999 using xda app-developers app

I wish you luck with it!
When you get a new card, there are ways to tell if its a fake or not. You will have to search them out as I really don't remember, but just so you know, the info is out there.
Sent from my SGH-T999L using xda premium

[SOLVED][Q] MicroSD card not showing up...Disappears on some ROMs

As the title says my microSD card is not showing up on some ROM's. It is a 64gb sandisk card. I have tried searching for an answer in this forum and on google but have not been able to determine the problem with my phones storage. It works on my computer when hooked to the data cable in the phone. It also works when hooked up with a sd adapter through USB. However, I cannot get consistent use of it on my phone. Some roms it works and some roms I always get a notification that it is safe to remove my SD card. When I try to mount it in the storage settings it attempts to mount but immediately says it is safe to remove it... Also the card seems to always show up in recovery. I made sure the checkbox for mounting the external card was checked in recovery.
Seeing how it works consistently on the computer I want to rule out that the card is not functioning properly but who knows?? I was hoping to see if anyone else ran into a similar problem.
I have been trying to flash a couple ROMs to find one that has call recording with my GS3. I have narrowed them down to S3rx, z999, or Dandroid. They seem to be the only ones that have call recording, working bluetooth, wifi, and usb tether, wifi calling. One other thing I wanted was Init.d so I could switch my internal storage with my extenal to increase my internal to 64gb and make the external 16gb. I have not tried to do the switch yet so I know that is not causing my microSD to disappear from the system.
Also, if anyone knows of a good working way to switch the internal with the external storage?? I know there are at least two methods for doing it.
OR if there is a working way to make the GS3 allow apps to be stored on the external card??
Let the games begin! (God, I love this forum!) :angel: I am praying for an answer....:fingers-crossed:

I'm guessing that its formatted as exFAT, correct?
Only TW roms can use this format. It won't work in aosp/cm roms. Youd have to reformat as Fat32.
Sent from my SGH-T999 using xda premium

I have formatted it on my computer which I thought formatted it as FAT32. My computer just gives the option to format...it does not give me the option of formatting it as a certain type...
Am I wrong that it formats it as FAT32 ??
Oh and how about what I should do with either exchanging internal and external memory or is there a program that will allow apps to be mounted on the external? I saw one or two posts on google that claimed that one or two programs would allow a person to mount apps on the external but thought it may be difficult....I thought the switcharoo method looked easier on the long run...???
Thanks for your response Doc!

I wouldn't trust that it'd automatically format fat32. If you right click the card and select format it should open a small window with choices for quick format and a drop-down menu to choose the format you wish to use.
If you check the properties it should tell you what it currently is though.
Can't answer your other questions as I just don't know about it. Sorry.
Sent from my SGH-T999 using xda premium

DocHoliday77 said:
I'm guessing that its formatted as exFAT, correct?
Only TW roms can use this format. It won't work in aosp/cm roms. Youd have to reformat as Fat32.
Sent from my SGH-T999 using xda premium
Click to expand...
Click to collapse
Okay...I did figure out that my card was formatted to exFAT !!
You were absolutely correct in your assumption. Windows 7 automatically formated it to exFAT when I reformatted it a week or so ago.
SO to all peeps out there make sure you format your card to the proper format!! Download a program off of the internet to do the work for you...
I found this one that worked just peachy >> http://www.ridgecrop.demon.co.uk/guiformat.exe

ExFat can be used on TW based roms. So if you use touchwiz, its better to use exFat on 32gb or larger sdcards.
I like using the sdformatter tool from sdcard.org. just another option.
Sent from my SGH-T999 using xda premium

Possible Reason
ASharpEdge said:
As the title says my microSD card is not showing up on some ROM's. It is a 64gb sandisk card. I have tried searching for an answer in this forum and on google but have not been able to determine the problem with my phones storage. It works on my computer when hooked to the data cable in the phone. It also works when hooked up with a sd adapter through USB. However, I cannot get consistent use of it on my phone. Some roms it works and some roms I always get a notification that it is safe to remove my SD card. When I try to mount it in the storage settings it attempts to mount but immediately says it is safe to remove it... Also the card seems to always show up in recovery. I made sure the checkbox for mounting the external card was checked in recovery.
Seeing how it works consistently on the computer I want to rule out that the card is not functioning properly but who knows?? I was hoping to see if anyone else ran into a similar problem.
I have been trying to flash a couple ROMs to find one that has call recording with my GS3. I have narrowed them down to S3rx, z999, or Dandroid. They seem to be the only ones that have call recording, working bluetooth, wifi, and usb tether, wifi calling. One other thing I wanted was Init.d so I could switch my internal storage with my extenal to increase my internal to 64gb and make the external 16gb. I have not tried to do the switch yet so I know that is not causing my microSD to disappear from the system.
Also, if anyone knows of a good working way to switch the internal with the external storage?? I know there are at least two methods for doing it.
OR if there is a working way to make the GS3 allow apps to be stored on the external card??
Let the games begin! (God, I love this forum!) :angel: I am praying for an answer....:fingers-crossed:
Click to expand...
Click to collapse
So I know you found a fix to your issue but if you do notice that your SD card begins to disappear again it might be the SD card itself.
I've read somewhere (great reliability sorry I don't have links) that on the GS3 there has been some issue with SanDisk specifically. I had two sandisk 32gb fail on me for no apparent reason and was wondering why they were doing this. I've already switched out to Kingston and I've not had any problems since. I'm not saying that this is the sure issue as my friend had a GS3 and used SanDisk and saw no issue but this is just my experience.
Best of luck to you and cheers.

I always just figured it was sandisk. That doesn't just happen on gs3's. Imo they just don't have near the quality of other manufacturers like samsung or Kingston.
Sent from my SGH-T999L using XDA Premium 4 mobile app

[Q] Damaged SD Card

I apologize if this thread is made too often. I've been searching around for a fix, however I can't seem to find anything.
I'm running Cyanogenmod on my GS3. I've had an 8GB SD card that I pulled over from my old Evo 4G that has served me well for years, however I figured it is about time I moved on after spending the last few months deleting apps and videos to make space for more. I purchased a Sandisk 64 GB SDXC card and am attempting to use it with my phone, however I get the dreaded "Damaged SD Card - Try reformatting" error.
Of note, the 8 GB SD card still works perfectly fine, so I don't believe it is a problem with the SD card slot or anything. In fact, this is the first time I've touched the slot since purchasing the phone a year or two ago.
I've tried many things that people have recommended to others from searching around, however nothing seems to have worked.
I've tried reformatting it with three different programs as well as running chkdsk on cmd.
I've tried letting the reformatting process on the phone, which is prompted to me when pressing the notification for the Damaged SD Card", run for 15 minutes and it continues to run with the message "Unmounting SD Card" (which is odd since the card isn't mounted in the first place).
I can read the card perfectly fine on my laptop through the card reader, however it does prompt me to format the card every time I switch it over from the phone to the laptop, saying something along the lines of it not being in a language the laptop can read. After formatting, I can view the card as a drive.
Does anyone happen to have a fix for this? I would really like to start using my new card.

From a quick Google search on your problem it seams that SanDisk and Samsung galaxy's don't play nice with each other due to a flaw in SanDisk cards you may want to contact SanDisk about the issue.
Sent from my SPH-L710 using Tapatalk

Did you format the SD Card to FAT32 before using it ?

spirithandler said:
From a quick Google search on your problem it seams that SanDisk and Samsung galaxy's don't play nice with each other due to a flaw in SanDisk cards you may want to contact SanDisk about the issue.
Sent from my SPH-L710 using Tapatalk
Click to expand...
Click to collapse
I suppose I will do that. Thank you.
prboy1969 said:
Did you format the SD Card to FAT32 before using it ?
Click to expand...
Click to collapse
The only options I'm given to format it is exFAT and NTFS. I have only tried exFAT.
EDIT: I searched around and found that Windows only allows you to format to FAT32 with 32 GB or less. I downloaded a Fat32Formatter program that let me bypass that, formatted the card, and it works perfectly now! Thank you so much!

Your welcome . Glad you got it sorted out.
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