Develop Bugs

[Q] SD card problems

Hi,
I have a problem with my 32 gb micro SD card.
It always worked fine until one day I one day I removed it and used the plastic adapter to save some media straight from the computer.
Now my phone reads the card (I can see it in My Files and can play the music and the movies) but cannot re-write the data (I cannot take pictures with the camera and save it on the card or update apps - which is really annoying because the phone always restarts). When I run the Task manager / Storage, it shows 0.0b/0.0b as if there was no SD card.
I tried to mount/unmount, turn on and off.
Do you guys have any idea how to solve it? Getting pretty desperate...
Kate

The only thing I can think to do is to transfer all your SD card data to your PC (use your SD adapter and plug card directly into PC).
Then put the card back into your phone, and use your phone to format it. Then it *should* be "problem solved". The only thing is, i think you have to be rooted and have ClockworkMod installed to format your card (the option is under "mounts and storage"). I can't remember the option being there in "stock" OS (it's been a while..lol) But whatever you do, DON'T format your card with your PC....I'm fairly certain that this will cause more problems than it'll fix. To transfer the files back to your card, you should use the USB cable that came with your phone, and plug the phone (containing the SD card) into your pc and transfer the files that way.......
Sent from my GT-I8150 using Xparent Green Tapatalk 2

I think you might have unplugged the SD card from your PC 'uncleanly', causing some errors. The Linux kernel of Android detected that, and refused to mount it RW.
In that case, formatting your SD card on the PC should be safe. But, instead of just formatting, I suggest you rebuild the card by deleting all partitions then recreating them. You can use the gratis MiniTool Home Edition to do that.
-- GT-I8150 + DXKL1 + CM9b3 + xda --

[Q] USB OTB/Micro SD Card Reader

Question question regarding USB OTG Cables/Micro SD Card Readers. I know you can view content on them (movies, music, documents, etc). However, can you write to the flash drive/micro sd card? Basically, I'm curious because I know I could store roms on the flash drive or micro sd and play them from there, but I would like to store saves to it as well (so saves would not have to be stored on the Nexus 7).
I'm interested in the Meenova MicroSD Card Reader (I go for the card reader over a USB OTG because I do not need a large flash drive - a 64GB micro sdxc is sufficient), just curious if I can write to it as well or only read.
Thanks!

I've had no trouble writing to my Kingston 16GB SDHC through a usb reader.
The only thing I would mention is that you'll need a custom kernel to access NTFS file systems. Also you should note that the kernel in question needs to have write enabled for the NTFS module. This had me stumped when installing a kernel without it enabled, and it only ever mounted it read-only. Of course, if you're using FAT then you don't need to worry about any of this.

a9y said:
I've had no trouble writing to my Kingston 16GB SDHC through a usb reader.
Click to expand...
Click to collapse
I'm close to purchasing the Nexus 7 2013. The one thing holding me back is the USB drive issue. I want to be able to access the drive via the microUSB port and read&write to it like I would on a PC. You know, open an excel file, modify it, and close/save. All on the USB drive. Are you saying that can be done easily enough? I don't mind rooting, either. Don't want to but can if necessary.

Thanks. So from your post and reading a few other posts, unless you're rooted, you cannot write to NTFS (only read), but you can write to Fat systems. I really don't plan on having any files greater than 4GB so I believe Fat will work. Thanks!

[Q] Micro SD card works on PC but not on S4

Hi,
I have just purchased 64 GB Class 10 Samsung micro SD card with a SD adapter and USB adapter.
I plugged it in to my S4 and everything seemed OK. Copied all of the contents from my old SD. Everything was working fine until I restarted my phone. After restart all of the files were present by could not access them. Some of the files and folders had ~ as prefix. Plugged the card in my PC and the files were corrupted. Recopied everything and tried several times again. The same outcome. Reformatted the card to exFAT and to FAT32 both from my phone or my PC using several available programs. No success. Whenever I unmount the SD card or restart the phone the files get corrupted. So I figured the card is broken. So I decided to test it only on my PC. Copied lots of stuff to it (music, movies etc.) and started using it on my PC. I have mounted/unmounted it on my PC probably 100 times and it works just fine. So that means that the card is fine (or am I wrong???). Also tried it to plug it with the usb adapter into my TV. It says that usb disk is empty.
The files only seem to get corrupted when I place the card in my S4 and unmount it/restart the phone. The card works just fine on my PC.
Does anyone else have this issue?
I am running a rooted 4.3 Android OS.
Thank you!

You have to partition the card into 32GiB chunks. So make two, 32GiB partitions and it will work fine in your S4, except it will show you have two external sd cards.
Sent from my SGH-M919 using XDA Premium 4 mobile app

vladimir.gjurovski said:
Hi,
I have just purchased 64 GB Class 10 Samsung micro SD card with a SD adapter and USB adapter.
I plugged it in to my S4 and everything seemed OK. Copied all of the contents from my old SD. Everything was working fine until I restarted my phone. After restart all of the files were present by could not access them. Some of the files and folders had ~ as prefix. Plugged the card in my PC and the files were corrupted. Recopied everything and tried several times again. The same outcome. Reformatted the card to exFAT and to FAT32 both from my phone or my PC using several available programs. No success. Whenever I unmount the SD card or restart the phone the files get corrupted. So I figured the card is broken. So I decided to test it only on my PC. Copied lots of stuff to it (music, movies etc.) and started using it on my PC. I have mounted/unmounted it on my PC probably 100 times and it works just fine. So that means that the card is fine (or am I wrong???). Also tried it to plug it with the usb adapter into my TV. It says that usb disk is empty.
The files only seem to get corrupted when I place the card in my S4 and unmount it/restart the phone. The card works just fine on my PC.
Does anyone else have this issue?
I am running a rooted 4.3 Android OS.
Thank you!
Click to expand...
Click to collapse
If you don't want to make two seperate partitions on your external microSD card then do the
following:
Remove your external microSD and plug it into a card reader and or the adapter which came
with the card then plug it into your computer.
Make an empty folder on desktop of computer and copy all files and folders from the microsd
card into the empty folder.
Format your external microsd using this windows utility and copy all the files/folders back onto
the card from your computer and replace it into your phone.
Here is the direct download link for this fat32 formatter which is a windows utility:
http://download.cnet.com/MiniAide-Fa...74ffba47b88ad1
By doing the above your external microSD card should work fine in your phone.
Good luck!

xdapowerapps said:
You have to partition the card into 32GiB chunks. So make two, 32GiB partitions and it will work fine in your S4, except it will show you have two external sd cards.
Sent from my SGH-M919 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Thank you for your reply. I did as you suggested and it worked for some time. I mounted/unmounted several times and it seemed fine. Then did a restart and the files were corrupted again.
Why does the card need to be divided in 2*32GB in the first place? Isn't the S4 suppose to support 64 GB cards?
Your suggestion seemed to isolate only part of the problem. It remains only the restart. What can be associated with corrupting data on sd card and android restart?

Misterjunky said:
If you don't want to make two seperate partitions on your external microSD card then do the
following:
Remove your external microSD and plug it into a card reader and or the adapter which came
with the card then plug it into your computer.
Make an empty folder on desktop of computer and copy all files and folders from the microsd
card into the empty folder.
Format your external microsd using this windows utility and copy all the files/folders back onto
the card from your computer and replace it into your phone.
Here is the direct download link for this fat32 formatter which is a windows utility:
By doing the above your external microSD card should work fine in your phone.
Good luck!
Click to expand...
Click to collapse
Thank you for your reply. Unfortunately it didn't work. I tried similar thing with other software also (Minitool partition wizard, Panasonic SD formatter, etc.). When I unmount/mount or restart data corrupts

vladimir.gjurovski said:
Thank you for your reply. I did as you suggested and it worked for some time. I mounted/unmounted several times and it seemed fine. Then did a restart and the files were corrupted again.
Why does the card need to be divided in 2*32GB in the first place? Isn't the S4 suppose to support 64 GB cards?
Your suggestion seemed to isolate only part of the problem. It remains only the restart. What can be associated with corrupting data on sd card and android restart?
Click to expand...
Click to collapse
No, it depends on your kernel if it supports a certain FS. I am not sure why your files are being corrupted other than one, your ROM isn't unmounting your card properly on restart or two, your card has issues. Again, I am not sure.
Sent from my SGH-M919 using XDA Premium 4 mobile app

In that case do you suggest I try changing kernel? Do you think that might help? My kernel version is 3.4.0-2082040 if that means something. Do all S4s come with the same or different kernel? Will it help If I unroot or maybe install other ROM for different country or different operator?

re: external sdcard
vladimir.gjurovski said:
In that case do you suggest I try changing kernel? Do you think that might help? My kernel version is 3.4.0-2082040 if that means something. Do all S4s come with the same or different kernel? Will it help If I unroot or maybe install other ROM for different country or different operator?
Click to expand...
Click to collapse
All the stock S4's come with the same kernel, so if your S4 is stock then it's not a kernel issue.
Have you tried any other external microsd cards, if not that's what I would do next.
Most of the better microsd cards have either a 2-3 year or a lifetime warranty.
Good luck!

I currently use my old 8GB sd card with no problems whatsoever. My S4 is rooted. Does that change the kernel? Should I unroot?
Misterjunky said:
All the stock S4's come with the same kernel, so if your S4 is stock then it's not a kernel issue.
Have you tried any other external microsd cards, if not that's what I would do next.
Most of the better microsd cards have either a 2-3 year or a lifetime warranty.
Good luck!
Click to expand...
Click to collapse

[Q] Cannot mount SD Card via USB OTG and stickmount (root) - works on Galaxy S2

Hi,
I recently bought a USB OTG cable and an "Integral USB 2.0 Single Slot SD Reader " so that I could use my Nexus 7 to view photos from my camera.
At first I tried using Nexus Media Importer to view files on the device, but this did not work. I have successfully been able to use this application to mount a USB thumb drive via the USB OTG cable.
I then rooted the device and installed stickmount. This did not seem to work either and there were no signs that the device was recognised by the tablet (the red light did not come on). I configured stickmount in SuperSU so that it has root access. I did not copy any data or apps back onto the device after unlocking it, and I am using the stock android 4.4.2 ROM.
I tried mounting the SD card using the card reader and USB OTG cable with my Galaxy S2 running Cyanogenmod. This mounted as soon as I plugged it in so I doubt there is a problem with any of the components.
I have tried mounting the drive both with USB debugging enabled and disabled. Is there anything else that I can try?
Thanks,
Ciaran

Reboot your device while keeping the OTG cable connected.
Sent from my Nexus 7 using Tapatalk

gnotelover97 said:
Reboot your device while keeping the OTG cable connected.
Sent from my Nexus 7 using Tapatalk
Click to expand...
Click to collapse
Thanks, this does allow the drive to mount successfully; however, if I remove the drive then re-insert it it does not remount, nor does it show up in Stickmount. Is there a way to remount the drive on-demand - just like my Galaxy S2?

You can press the 'thanks' button if it helped. Till now, I have not come across any such method to mount the OTG cable on demand. It's a cheap ploy by Google and Asus that they do not allow native OTG support on the Nexus 7 2013. Just to promote the cloud services. Mounting OTG cable is so easy on the Moto G and Samsung devices. It's a given these days.
Sent from my Nexus 7 using Tapatalk

ciaranhearne said:
Hi,
I recently bought a USB OTG cable and an "Integral USB 2.0 Single Slot SD Reader " so that I could use my Nexus 7 to view photos from my camera.
At first I tried using Nexus Media Importer to view files on the device, but this did not work. I have successfully been able to use this application to mount a USB thumb drive via the USB OTG cable.
I then rooted the device and installed stickmount. This did not seem to work either and there were no signs that the device was recognised by the tablet (the red light did not come on). I configured stickmount in SuperSU so that it has root access. I did not copy any data or apps back onto the device after unlocking it, and I am using the stock android 4.4.2 ROM.
I tried mounting the SD card using the card reader and USB OTG cable with my Galaxy S2 running Cyanogenmod. This mounted as soon as I plugged it in so I doubt there is a problem with any of the components.
I have tried mounting the drive both with USB debugging enabled and disabled. Is there anything else that I can try?
Thanks,
Ciaran
Click to expand...
Click to collapse
It's gotta be the connections your using. Either the Integral SD Card Reader, or the OTG cable you are using. I never have any issues using stickmount with my Meenova MicroSD card reader. Have you tried other adapters?

charesa39 said:
It's gotta be the connections your using. Either the Integral SD Card Reader, or the OTG cable you are using. I never have any issues using stickmount with my Meenova MicroSD card reader. Have you tried other adapters?
Click to expand...
Click to collapse
^This, stickmount mounts my meenova as well as my OTG+USB thumbdrives on demand, no issues whatsoever, no need to reboot or anything, it just automounts and it's ready to go.

Phone formats micro sd card automatically when mounted

Phone formats micro sd card automatically when mounted, without permission. Each time I put the card in it gets wiped. I'm trying to download dash cam footage to my phone but as soon as the card is inserted into the slot, it gets wiped. Can this be stopped?

Use the USB cable to upload directly from your PC. You'll need the Samsung driver for that.
The card may have an incompatible file system on it or data corruption. Bypass using a card with data on it to help understand this behavior.
Try formatting the card in the phone.
If that doesn't work, on the PC use a low level formatting app to format/check it for bad sectors, etc. Then format it again using the 10+.
The issue may be the 10+ either hardware or firmware. Try a -known- good card in it.
The Lexar V30 512gb cards work perfectly.
All I did was format it with the 10+

blackhawk said:
Try formatting the card in the phone.
If that doesn't work, on the PC use a low level formatting app to format/check it for bad sectors, etc. Then format it again using the 10+.
The issue may be the 10+ either hardware or firmware. Try a -known- good card in it.
The Lexar V30 512gb cards work perfectly.
All I did was format it with the 10+
Click to expand...
Click to collapse
The card is formatted by the dash cam as fat32 I think. Not sure if the dash cam will recognize it if I formatted using the phone. I'll try.

ognjen992 said:
The card is formatted by the dash cam as fat32 I think. Not sure if the dash cam will recognize it if I formatted using the phone. I'll try.
Click to expand...
Click to collapse
I would avoid using it like that; download/upload to the card in the phone instead.
It's transfers data at about 1.5 gb per minute via USB2. Also constantly pulling the card can cause trouble. That card tray is not robust. It's far safer to leave it embedded for a number of reasons including ESD.
Using different devices to add data to a card can cause card corruption. A common issue when using multiple Canon cams.
Formatting the card in the device before using eliminates the issue.

I'm not sure anyone is understanding the issue here. The micro sd card is used in my dash camera to record while driving. The camera itself doesn't have an USB interface or wifi. The only way to transfer footage is to take the card out of the camera and put it into my phone, or pc. On pc it works fine, I plug in the micro sd using an sd adapter, and copy the footage. But It's a hassle on the road, so I tried using my galaxy note 10+. However, as soon as I put the micro sd card into the phone, it gets formatted, contents (footage) deleted, and android folders created, automatically. Is there a way to prevent this so that I can open the footage on my phone?
Thank you all for help, it's been driving me nuts.

ognjen992 said:
I'm not sure anyone is understanding the issue here. The micro sd card is used in my dash camera to record while driving. The camera itself doesn't have an USB interface or wifi. The only way to transfer footage is to take the card out of the camera and put it into my phone, or pc. On pc it works fine, I plug in the micro sd using an sd adapter, and copy the footage. But It's a hassle on the road, so I tried using my galaxy note 10+. However, as soon as I put the micro sd card into the phone, it gets formatted, contents (footage) deleted, and android folders created, automatically. Is there a way to prevent this so that I can open the footage on my phone?
Thank you all for help, it's been driving me nuts.
Click to expand...
Click to collapse
I do understand. Been there, done it and lost data because of it.
Download to PC only*.
That card swap is the problem.
*a card reader on the C port would probably work.

blackhawk said:
I do understand. Been there, done it and lost data because of it.
Download to PC only*.
That card swap is the problem.
*a card reader on the C port would probably work.
Click to expand...
Click to collapse
Tried the reader, also wipes it. Maybe using an sd reader with an adapter and write protect in lock position
I didn't know it's a known issue. Kinda dumb it wasn't resolved.
Thank you!

ognjen992 said:
Tried the reader, also wipes it. Maybe using an sd reader with an adapter and write protect in lock position
I didn't know it's a known issue. Kinda dumb it wasn't resolved.
Thank you!
Click to expand...
Click to collapse
I've seen it with Canon cams; you never use the same SD card in different cam without formatting it first.
It can corrupt the card...
It's odd the phone auto formats the card. Never saw that before.
Almost like it's some sort of script command on the card.

ognjen992 said:
Tried the reader, also wipes it. Maybe using an sd reader with an adapter and write protect in lock position
I didn't know it's a known issue. Kinda dumb it wasn't resolved.
Thank you!
Click to expand...
Click to collapse
It's the FAT32 filesystem. If that's all your camera can use, then you will have to first transfer to a PC and then use a USB cable to transfer to your phone OR maybe use an OTG cable to transfer it from a card reader.
Don