Develop Bugs

[Q] "SD Card mounted as read-only"?

Hi,
I'm posting this issue second time. I have a class 2 SD card with almost 1700mb of ext3 partition. the problem is that my SD turns to read only when accessing some files from my sd card. it says in the notification SD card mounted as a read only and then say "tap" to resolve the card responded unexpectedly.
tapping on it sometimes help if i remove the files that I was trying to access that created the problem. otherwise it mounts it as read only.

Hi, you sure your card is a genuine one? The problems you are having are identical to what I had. Turns out my 32gb card was in fact an 8gb card, and the problem was when capacity was reached it would go to read only. The only way to rectify this was to take the card out, place it in my PC card reader right click on properties of the drive and run the error checking tool. Hope this helps. Got my money back anyway thought £36 was a bit cheap lol! Try writing a large file to the card using your Computer, this should give you an indication if the card is genuine or not.

lewyharvey said:
Hi, you sure your card is a genuine one? The problems you are having are identical to what I had. Turns out my 32gb card was in fact an 8gb card, and the problem was when capacity was reached it would go to read only. The only way to rectify this was to take the card out, place it in my PC card reader right click on properties of the drive and run the error checking tool. Hope this helps. Got my money back anyway thought £36 was a bit cheap lol! Try writing a large file to the card using your Computer, this should give you an indication if the card is genuine or not.
Click to expand...
Click to collapse
Card is genuine. I have placed my card several times in my brothers htc hd and formatted it through windows. its almost 8 gb i checked it on windows. last time I deleted a folder which has wiered name as if the folder was corrupted. I deleted that folder n it was running fine again. but its back again.
mine came with telus, so it should be genuine. what does class signify? like i have class 2, what does it mean?

CLass is the speed of read and writes.
I recently had a problen like this it turned out to be a corrupt file in the .secure folder used for apps to sd.

rchatburn said:
CLass is the speed of read and writes.
I recently had a problen like this it turned out to be a corrupt file in the .secure folder used for apps to sd.
Click to expand...
Click to collapse
then I guess its because of corrupt files but why is it so often specially when I copy something from windows.

I had this problem once after disconnecting from a Windows PC, simply connect the sd car directly to a computer and run the windows verification tool, it finds the corrupt file and your sd card starts working again

hey i recently had the same problem ,, but i figured it out and this method should work fine...!!
>First of all you should know how this problem has occurred..??,
well the reason is, we all connect the phone to system in usb mass storage mode ,,but while removing we'll only give safely remove in the system and forget to do the same in the phone ,,,trust me this the core for this problem....sd-card cannot be fully unmounted by system ,,, so you have to manually do this by your phone
so if you are using the sense rom ,,after ejecting the disk in the system ,,,in your your phone's notification area
in ''connect to pc'' menu select charging only .....this will completely unmount your memory card .
>if you are using non sense rom ,,"turn off the usb" mass storage
do this every time you connect your phone to the system ..!!!
ok now solution for your problem..
>reboot your phone to recovery mode using rom manager...
>select partition menu
>now select mount usb storage ,,,
>now you have tow options
1. either you backup every thing and format your sd-card (recommended)
or
2.mount your sd-card and check for errors in windows,,,
this should fix your problem ..
remember ,,next time when you are connecting your phone don't direly unplug the the cable..!!

qariboy said:
Card is genuine. I have placed my card several times in my brothers htc hd and formatted it through windows. its almost 8 gb i checked it on windows. last time I deleted a folder which has wiered name as if the folder was corrupted. I deleted that folder n it was running fine again. but its back again.
mine came with telus, so it should be genuine. what does class signify? like i have class 2, what does it mean?
Click to expand...
Click to collapse
The Class number represents a multiple of 1 MB/s
So if 2 is written on ur SD card then it means that its capable of a read speed of 3MB/s

>First of all you should know how this problem has occurred..??,
well the reason is, we all connect the phone to system in usb mass storage mode ,,but while removing we'll only give safely remove in the system and forget to do the same in the phone
- Not always true, its happened to me on several occassions when not connected to PC etc... Flickie HD caused mine
If you have a mac the fix is - disk utilities - repair card
Full format I found to be better though

[Q] G2 Blank SD Card Error

G2 running Cyanogenmod 7.1.0 RC1
I updated from 7.0.?? a few days ago and today I got this message
"Blank SD Card. SD Card is blank or has unsupported file system." I have read quite a few posts on this issue but havent found a solution. I am using a non-stock 8gb card. Also tried this with a 16gb card and got the same error. Tried using a card reader but my computer (vista) gives no sign that a card is even present. Tried inserting my card into a friends sidekick 4g and got the same message. Wouldnt let me format on either phone. I am pulling my hair out! Please help and thanks.
UPDATE: My friends 8gb sd card from his sidekick 4g works fine in my phone but neither of my cards work. Is there an easy way to access my cards from my pc so i can format them?

I'm having this problem as well.

This is not just a suggestion, even though it seems fairly simple. I had the same issue with my Desire Z, and fixed it.
I took the microSD, put it into the phone.. Reboot the phone then go to Settings > Storage and "Erase SD Card" (I am assuming you don't have any valuable info in there.. if you do then back it up somehow.. This is only for free of memory cards).
After you erase it, even if you reboot it, the phone won't recognize it. So take the battery out/power off the phone, put it into the computer. If you're using a PC, go to the Removable Disk that is your microSD, right-click and Format it. Use Fat32, and just format it. (Maybe Quick Format will work, but I just did normal format, took 15 seconds).
After it's done, put it into your phone, boot it, and it should prepare your microSD for usage.
This worked for me, let me know if it does for you!

This issue just occurred on my G2 today at roughly 4:30 pm CDT. I've been running a Patriot 16 GB Class 10 microSD on this device since early April with no problems whatsoever. The other two G2 devices and one MyTouch4G we have are not experiencing the issue at this time.
Symptoms:
- The microSD card is no longer recognized by the G2 Android 2.2 device
- connecting the G2 to either my Windows or OS X notebooks no longer prompts me to enter USB Mode
- device sees the computer and computer(s) see the device after changing G2 to Development - USB debugging mode and connecting it to either the Windows or OS X notebooks
Corrective actions:
- soft reboot ==> no change
- power down - wait 5 mins - restart ==> no change
- power down - remove battery and microSD card - check microSD card contacts & phone contacts - replace microSD and battery - restart ==> no change
Before going into any more invasive or possibly destructive repair efforts, I came to XDA to see if my situation is a one-off or part of a larger pattern.
Appears that this isn't a unique problem.
I'm going to try the stock microSD 8 GB in the unit and will update this thread with results or additional actions.
Good times...
UPDATE: Problem corrected, at least for now.
- pulled the Patriot 16 GB class 10 microSD and used my Kingston MobileLite SD/microSD-to-USB adapter to backup the files from the card to my notebook
- formatted (NOT quick format) the microSD card as FAT32, 32KB allocation size, no volume label
- ran the full format process on the microSD card twice to minimize lingering "noise" on the card
- inserted the microSD into the G2, rebooted and allowed it to mount, fully prepare and download the configurations saved to Google
- confirmed the microSD had mounted and the G2 recognized the entire disk volume
- powered down the G2 gracefully
- pulled the microSD and reattached it to the notebook using the Kingston adapter
- used Unstoppable Copy v5.2 to transfer the 11.2 GB of backup files from the notebook to the microSD - no errors reported
- reinstalled the Patriot microSD in the G2 and powered up
Everything is functioning nominally, all data appears to be recovered. Tested the microSD with SD Tools and all the specs are reporting identically as they were before the incident with read & write performance well above Class 10 levels, (read:21.8 MB/s / write: 14.2 MB/s).
We'll see if the issue resurfaces.
As always, YMMV.

Well I have called HTC and they are sending me a new 8gb SD card on the condition that I ship the old one to them at my own expense. They also acknowledged their awareness of the problem and informed me that they have seen a number of devices burning out the cards. They told me to try the new card and if it happens again I will have to ship my phone in for repairs. I have stuck by HTC for years now, tilt, g1, inspire, g2, and never had a problem, but I feel that their solution, forcing me to pay for return shipping miniscule as it may be, is unacceptable. Im just lucky my phone was still under warranty.

The problem is that no device, my pc included, will recognize the card. It acts like the drive is empty. According to HTC the card is permanently fried but I dont think that is the case.

Wow this is worrying . . . . . I have alot of pics and music on my sdcard which i havnt backuped and wud be devasted if i lost!! Time for backup methinks

Jandyman said:
Wow this is worrying . . . . . I have alot of pics and music on my sdcard which i havnt backuped and wud be devasted if i lost!! Time for backup methinks
Click to expand...
Click to collapse
Wish I did. I lost a ton of stuff. I wont make that mistake again. Also just to put this out here, a friend of mine got the same error today on his HTC Surround.

[Q] Sd card unmounting

I have adata 16Gb class 10 card I order her trough ebay It's original for sure, and I have been using her for like half a year or so, and recently when my mobile shuts down (low battery) my mobile said blank card and and to format her. I have htc desire(amoled) I'm using Runnymede 6.1 stable ROM, and I don't think that has do to anything with my card blank, becouse it was happening on previous rom two but just so you know. Can someone please help my I tried full format ejecting card putting her back, and same thing, is my card dying ?

Did you check your card on a PC? Is it recognized and can you access it? If so, make a backup and try to check the card with on board tools (e.g. for Windows: http://www.ehow.com/how_6857598_check-sd-card-errors.html).
Alternatively, there are plenty of tools on the web, like
SDFormatter (https://www.sdcard.org/downloads/formatter_3/)
or
H2testw (http://www.heise.de/download/h2testw.html)
Good luck!
PS. A while ago, I also had some trouble with my Samsung 16GB Class 10 MicroSD. I formatted it again and had since no more issues.

When I format her (trough my phone usb becouse I don't have sd card reader) she is okay again and PC recognized her but after some time she did that again blank sd and that usually happends when my phone shuts down not by me but when battery is low even sometimes for some other reason, it's iritating becouse I have to format her and install ROM again.

Mmh, it is a little hard to tell whether the problem is solely down to your sd card or also to your phone, as long as you are not able to test the card outside the phone with a PC etc. Have you tried touse the PC tools in disk drive mode? According to this thread, H2testw works this way. You might also wanna try apps from google play/android market, e.g. 'SD Tools' or 'SD Card Tester'. I have not used any of those, so I can't tell if they are useful.
Finally, don't you have any opportunity to use a friend's PC or borrow a card reader? Nevertheless, I would strongly recommend you to buy a proper (from my experience the cheapest ones suck, e.g. are very slow, don't recognize some card formats) card reader, either a multi-format one or a microsd2usb one.
If you still have guarantee on your card, why not simply get a replacement by the reseller? I mean, if you can still access the card (at least for a while) then you should be able to create a backup and later restore it to a new card.

tablord said:
Mmh, it is a little hard to tell whether the problem is solely down to your sd card or also to your phone, as long as you are not able to test the card outside the phone with a PC etc. Have you tried touse the PC tools in disk drive mode? According to this thread, H2testw works this way. You might also wanna try apps from google play/android market, e.g. 'SD Tools' or 'SD Card Tester'. I have not used any of those, so I can't tell if they are useful.
Finally, don't you have any opportunity to use a friend's PC or borrow a card reader? Nevertheless, I would strongly recommend you to buy a proper (from my experience the cheapest ones suck, e.g. are very slow, don't recognize some card formats) card reader, either a multi-format one or a microsd2usb one.
If you still have guarantee on your card, why not simply get a replacement by the reseller? I mean, if you can still access the card (at least for a while) then you should be able to create a backup and later restore it to a new card.
Click to expand...
Click to collapse
I run H2testw and no error found. I was planing to buy microsd card reader allInOne and that kind of reader I know that cheap one sucks, but I didn't have anything to put in until now I mean I still have my phone and card in it and when I connect it to PC I can format her so I don't know should I really bought that reader...I don't know about guarantee becouse I throw away that serial number that was on the case and with that serial number you can register on adata site and see If you still have guarantee but now I can't becouse I don't have it

[Q] micro SD card will work or....?

I have two microSD cards:
- 1st one came with my SE Xperia Arc S, and has 8GB
- 2nd one came with Samsung Focus (Windows Phone7) and has 16GB
...And thats all I know about them.
I pulled out the second one from S.Focus, and tried to use it in Xperia Arc but the phone acts like there is no card inserted, also tried the other way, with 8GB from Sony in Samsung Focus, with the same result.
Do I miss something here? Is there a preparation needed or something like that?

You will need to format the card from within the phone to get the right file structure.
If you need the data back up to pc,format card, then re place the data back again.
Sent from my LT18i using XDA App

Is there a possibility that Samsung's card is not compatible with Xperia and vice versa?
Tried to format it from within Xperia but that 16GB simply not detected, also format (prepare?) options are greyed out. Maybe would need to format it first on PC them move to Android hm.

If both are "Micro SD" cards, and looks the same(size and shape), then it should be "compatible". If it doesn't work, I reckon the card is damaged, and therefore can't be read by your phone.

From settings did you unmount the card to format?
If card not recognized by phone then only option is to format with pc. Make sure you format with right properties ie fat32.
If after this card still not recognized by phone then think it is damaged.
Sent from my LT18i using XDA App

Try using a PC to copy the contents first (if you need to).

My cards are fine, and working well on their origin phones, the problem begins if I try to swap them.
Well gonna try again, with unmounting first.

Finaly managed to do it after some research....
I will write how I did it, so maybe someone else can find that usefull:
0. Dismounted 8GB card on android menu and pulled it out
1. Backed up data from 8GB android card on my pc
2. Unlocked Focus card with SD unlock (thru the Windows Phone app)
3. Formated 16GB Focus card with SD Formatter 3.1 (full format with erase) on PC
4. Copied saved data to 16GB card and inserted to android phone - everything fine and working well
5. Inserted 8GB card to Samsung Focus (I didnt do anything before, it still has Android data inside)
6. To make new sd card work had to reset the phone to factory but it had custom bootloader and I couldnt do it via hardware keys (soft method was off limits) so I flashed it to WP7 rogers rom (a carrier official rom)
7. Samsung Focus booted and 8GB android card were detectable and working fine.
Not that easy as it seems, cant we just swap the cards eh?

Glad to hear you got them working.....
If the cards are out the box then yes they clean plug straight in .but if used before on different Phones which run different os then the file structure on the card will be different..... So neither can read the other card.
Sent from my LT18i using XDA App

[Q] Problems using Galaxy Tab S as USB device

I have purchased a week ago a Galaxy Tab S 8.4 (T705M) and I am using a 64 Gb MicroSD in it.
I upgraded to 5.02 (OTA) since June/26.
I have problems with external MicroSD when the tablet is connected via USB to my PC (Windows 7, Home, 64 bits).
Whe trying to copy files from the PC to the tablet external MicroSD, the operation is very, very slow and some files (existing previously in the external MicroSD) disappear. Very annoying.
I had same problem with another Tab S I purchased by January and I returned it to the vendor. In that case, the tablet was on Kit Kat (as it is sold).
Yesterday, after the Tablet erases several directories from the SD, I turned off the tablet and extracted the SD. I tried to fix the SD directly connected to the PC but the SD appears as "read only".
After trying for a while I gave up and I formatted the SD (extFAT) and copy the info from a backup I did before putting the SD in the teeth (fangs?) of the tablet (yeah, I guessed the tablet would be as a wild beast when managing SD's). The "re"formatted microSD behaved as a charm, all info copied without any problem (but it took almost 3 hours copying 50 Gb at about 7 Mb/second).
On the other hand, I used this same SD card in my old Note 8 (Jellybean) for more than a year without problems.
Now, I guess the only way I have is extracting the SD card and edit its content only connecting it directly to a PC.
What can I do to calm down the beast and edit external MicroSD connecting the tablet via USB without losing information and with a reasonable speed ?
Any suggestion ?

Root your device and apply the sd card fix. Also 7mb/s seems about normal for a cheap micro sd card.

I have not had any problems with files disappearing, have you confirmed your 64gb microsd is not a fake.
I have a Samsung 64gb microsd, and i got around 9MB/s copying a movie from my notebook to my T800 10.5"
John.

Thanks for the comments.
My card is Verbatim Class 10 and it worked perfectly in my old Note 8. It works really as stated for a class 10 SD (10 MB/s at peaks as stated in https://www.sdcard.org/developers/overview/speed_class/) but, as with any device, speed depends on several factors (file sizes, buffer in the source PC, etc) and the average obtained is really about 7 MB/s or so.
I guess the problem is related with something in Lollipop (but Tinderbox says has no problems) or, more probable, driver in the PC.
Tinderbox, are you using Kies to transfer ? are you transferring from a PC or a Mac ? which class is your SD ? have you enabled "USB debugging" ?
I purchased an 8 GB SD in order to make some tests. This SD is Class 4 and formatted FAT32 but anyway I will test it to learn about this riddle....
In the mean time, any suggestions are welcome and I repeat, thanks for the answers.
UPDATE:
Sandisk SD (8 GB, FAT32) worked perfectly, no erases, good speed (Class 4, speed tablet connected via USB about 4 MB/s).
Next test planned: reformat Verbatim 64 GB using FAT32.

I am on kitkat 4.4.2 and i dont use kies, I just drag and drop my files from my notebook to the tablet, I did not need to enable usb debugging, my 64gb is full of video, I copy them virtually every day and have had not problems.
I think i read about another 8.4" owner having problems with his microsd card i will have a look for it.
I have only ever bought Samsung memory cards for years and i have never had a problem.
Have you tried re-installing the device driver, you can do it from the kies menu.
John.

Tinderbox (UK) said:
I am on kitkat 4.4.2 and i dont use kies, I just drag and drop my files from my notebook to the tablet, I did not need to enable usb debugging, my 64gb is full of video, I copy them virtually every day and have had not problems.
I think i read about another 8.4" owner having problems with his microsd card i will have a look for it.
I have only ever bought Samsung memory cards for years and i have never had a problem.
Have you tried re-installing the device driver, you can do it from the kies menu.
John.
Click to expand...
Click to collapse
Thanks for your complete answer(s).
I have made several (a lot) of tests without any success. In all cases SD can not be written from a PC (when connected via USB) and erasing files using android app sometimes cause corruption.
The card is completely readable (a little laggy to begin to work after it was unmounted and reinserted). The card works without errors when connected directly to the PC.
These are the some tests I have made (reformatting and restoring the files between one test and the next, a real nightmare ):
1. Uninstalling Kies
2. Reinstalling Kies (and refreshing driver)
3. Uninstalling Kies and Samsung driver. Uninstalling USB driver and erasing it completely and let windows select the driver
4. Formatting the card in FAT32 via some software
5. Trying to format the card via command in windows (from the console). It takes about one hour and abort near the end with an error messages explaining that windows can not format FAT32 for this capacity
6. Even trying to partition the SD via DISKPART. I can create one primary partition (32000 MB) but DISKPART shows all disk allocated and do not allow to create another partition (either primary or extended)
Last symptom: I erased one file from the root directory of the SD using "My files" (the app preinstalled in the firmware by Samsung). The file disappear but My files shows a ghost file named with special characters.
When the SD is consulted via Root Explorer (an android file manager) or even connected directly to the PC, the ghost file did not show.
@tinderbox: could you remember who (or where do you read about) the other " 8.4" owner having problems with his microsd card " ?
Some body could suggest solution ?
Thanks for any help or guide.

Hi.
You did format the micosd card using the tablet, you cannot format on an computer and then use it in your tablet, the tablet uses it own file system, so you have to format the microsd using the tablet.
John.

Format the card to exFat in windows. It only takes a few seconds to format my Samsung Evo 64gb.
If it doesn't work then your card likely has issues.

Finally success
Thanks for your suggestions.
I tried almost everything:
1. Formatting FAT32
2. Reformatting in the tablet
3. Reformatting in the PC
4. Even formatting using a software from Verbatim website
The problem persists: SD Card is not editable (delete files, write files, edit files) when inserted in the tablet. SD works perfectly in the PC.
Finally I purchased another SD 64 Gb Toshiba Class 10. The SD package says it can work at 40 Mb/sec. The card write at 10 Mb/sec but it reads faster.
This Toshiba card works perfectly. I can erase or move files using android file manager (My Files app), I can write from the PC using tablet connected via USB to the PC. I can create files directly in the tablet (I used Jota+ to create a text file).
Verbatim card and Toshiba card specs seem identical, except by the speed claimed in the Toshiba package. There is some difference I am missing but definitively these cards are not equal (something in the card data bus ?)
I repeat, thanks to everybody who tried to help.

I only ever buy Samsung memory cards for years, and i test every one for errors and i have never found any, And if an Samsung memory card does not work in an Samsung tablet, well it is not going to happen, but people go for the cheap alternative.
John.