Develop Bugs

[Q] SD Card Not Being Used

So, a month ago I installed the Play Edition ROM on my S4. However, I've noticed that since then, no apps are using the SD Card. After Googling, I found the fix is supposed to be altering the platform.xml file so include <group gid = 'media_rw" /> under the WRITE_EXTERNAL_STORAGE permission. However, when I looked, it was already there. Looks like the ROM author already fixed that before I flashed it.
But still, no data is going to the SD card. It's there, and I can access it and manually move files over with Root Browser, but none of my apps are putting anything on there. Any ideas?

[FIX] TMO N900TUVUCNB4 External SD Card Write FIX

> > > TMO N900TUVUCNB4 External SD Card Write FIX: < < <
tekhd.com/downloads/tmo_kk_extsd_fix.zip
I just ask for a simple thanks...
This will make Titanium, Root Explorer or any app be able to write to external SD Card...
-> Just flash this zip file via TWRP or CWM...

TEKHD said:
TMO N900TUVUCNB4 External SD Card Write FIX: (TMO OFFICIAL 4.4.2 KK)
tekhd.com/downloads/tmo_kk_extsd_fix.zip
I just ask for a simple thanks...
This will make Titanium, Root Explorer or any app be able to write to external SD Card...
Click to expand...
Click to collapse
FIRST!
Damn, well that was fast. Thank you!
Also, I don't think this should be in "Themes and Apps." This isn't a theme nor an app.

Looks like only 1 line was changed in the following if I am correct. I just edited/compared. I only saw the one change though.
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>

NMonster69 said:
Looks like only 1 line was changed in the following if I am correct. I just edited/compared. I only saw the one change though.
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
Click to expand...
Click to collapse
Yes... correct...

TEKHD said:
TMO N900TUVUCNB4 External SD Card Write FIX: (TMO OFFICIAL 4.4.2 KK)
tekhd.com/downloads/tmo_kk_extsd_fix.zip
I just ask for a simple thanks...
This will make Titanium, Root Explorer or any app be able to write to external SD Card...
Click to expand...
Click to collapse
This is awesome... can this be applied using a stock bootloader?
(Basically, install instructions for us newbs would be greatly appreciated)
Thanks!

Store on External Card and install via TWRP?

sacky73 said:
Store on External Card and install via TWRP?
Click to expand...
Click to collapse
yes

Defenestratus said:
This is awesome... can this be applied using a stock bootloader?
(Basically, install instructions for us newbs would be greatly appreciated)
Thanks!
Click to expand...
Click to collapse
Only through custom recovery. If you don't have a custom recovery, but are rooted, you can add the missing line. Use a root file explorer, go to: ~/system/etc/permissions, then edit the platforms.xml with the root file explorer's text editor, and add the missing line <group gid="media_rw" /> (as in post #3). Reboot, and test if apps now have access to external storage (Don't quote me on these steps. Maybe Google them to make sure how to do it). The details to do it manually are more involved, and you need to know exactly what you are doing. That's why the OP has posted the awesome zip. Flash, and done.

bobbyphoenix said:
Only through custom recovery. If you don't have a custom recovery, but are rooted, you can add the missing line. Use a root file explorer, go to: ~/system/etc/permissions, then edit the platforms.xml with the root file explorer's text editor, and add the missing line <group gid="media_rw" /> (as in post #3). Reboot, and test if apps now have access to external storage (Don't quote me on these steps. Maybe Google them to make sure how to do it). The details to do it manually are more involved, and you need to know exactly what you are doing. That's why the OP has posted the awesome zip. Flash, and done.
Click to expand...
Click to collapse
This worked great. Thank You!
(I need to find a recovery that will flash to the new 4.4 N900T - CWM wont)

Defenestratus said:
This worked great. Thank You!
(I need to find a recovery that will flash to the new 4.4 N900T - CWM wont)
Click to expand...
Click to collapse
This is the only recovery that works with 4.4 as of now. Download the tar, and ODIN it to your phone:
http://goo.im/devs/philz_touch/CWM_Advanced_Edition/hlte

Anyone else having problems with this? I installed, i see the lines of code, but apps like swiftkey cannot access to write. Any ideas?
Sent from my SM-N900T using Tapatalk

aerichards1977 said:
Anyone else having problems with this? I installed, i see the lines of code, but apps like swiftkey cannot access to write. Any ideas?
Sent from my SM-N900T using Tapatalk
Click to expand...
Click to collapse
yup, i see the lines but the phone doesnt recognize the card.
edit: turns out my card was bad, got a new one and its working great!!!!

Works Great!:good::good::good:

Could be my card is bad, but after using this fix for a few days my card became read-only. Like, period. I can't format it on my PC or my phone. I can access all files, but I can't delete or modify them. Any clues? I've asked around on XDA and there's one other person with this issue, but no fixes. I will try to get my card replaced through warranty in the meantime.

I have an lg gpad and a note 3 this works on the note 3 but gpad I havent tried this yet.I flashed a rom based on stock and card doesnt write to apps only lg apps the rom claims it has the sd card fix but doesnt work like my note 3 my queation is if I flash this on the gpad will it mess anything up.The devs dont seem to be making any roms so Im stuck looking elsewhere
Sent from my SM-N900T using Tapatalk

Nice!
Sent from my SM-G900W8 using XDA Premium 4 mobile app

Thanks!

I'm still unrooted (damn Knox!) but rapidly coming to the conclusion that I just can't work on an unrooted phone any more, warranty or not.
Is there a non-root fix for this issue (as I know that apps like ES Explorer manage to bypass it on stock phones).
Andre

Thank for help to bring back ownership of my Memory Card to me
I'm again owner of my 64GB card- not Google ! My PlayerPro no more were updating ratings for songs ( end developer of PP was to lazy to try created designed folder on the card for the music ?) This was one of the reasons why I rooted the phone;so after I added this line (<group gid=”media_rw” />) everything is working again like was before update 4.4.2 on my Note 3- N900T.
Another thing what I looking for- is increase volume of my Bluetooth stereo headset. I successfully increased volume for wired headset and speaker (speaker- mono- is not strong side of this phone) with edited: mixer-paths.xml, but I can't find line or solution for the bluetooth, maybe someone can help me with it ?
Note: all changes I did using Root Explorer; could be done also with ES File Explorer

Changed permissions for media write and still does not work
TEKHD said:
Yes... correct...
Click to expand...
Click to collapse
I changed the permissions for the WRITE_EXTERNAL_STORAGE. I used different apps that automate this task and Xposed installers HandleExternalStorage. The permissions are changed and everything works for a little while as it use to. I delete files I no longer need and they are gone only to show back up in their old directories again as if I never deleted them. I can't save my music or delete old music from the external storage either. When I delete old photos or the entire DCIM directory on the external storage is goes away only to return about 40 minutes later. I have been dealing with this for several days and am getting a bit ticked off. Now I have a new Note 3 with 32gb internal storage and 32gb external storage except the external storage is not writable, I could have had that with an iPhone. The reason I went with an android was the flexability of storage but that looks like it is gone.
Anyone else have this problems? As I said the file permissions were changed and look good.
Thanks

[Q] SD Card Fix Issue With P600

Hi,
I hope someone has suggestions on the following issue. I've searched threads, but haven't found this specifically.
I need the ability to R/W with multiple programs to my SD card. Due to work and also teaching concerns, I need to access directories of ebooks, articles and databases that are large and in the past were synced from the cloud to my device. Obviously KitKat makes an issue of this.
I recently obtained a Samsung Galaxy Note 10.1 2014 P600. Refurbished by the manufacturer. This has only a one-month warranty so rooting wasn't a concern.
1. I rooted the device using CF Autoroot. Rooting was confirmed by Root Checker.
2. I ran SDFix. No joy. Access to the SD card was sporadic - for example - music on the card would only play 2 seconds of each song.
3. Using Titanium Backup, I froze all Knox-related programs (this was more than the list of 6 I think. I can provide a list later.) Later, I also backed-up and deleted the programs.
Access to the SD card was still sporadic. After a reboot, I might have access for a few minutes, and then restricted access again.
4. I then tried Xposed Framework and the "Handle External Storage" module (see the 3rd method in this article http://technofaq.org/posts/2014/04/fixing-external-sd-card-write-issue-on-android-kitkat/). This worked but still had issues - I had drive access but from time to time it would disappear - it would seem to randomly unmount.
5. But, I decide to keep trying and in the process went to create a folder with File Explorer. FX gave me a message about KitKat - and asked if I wanted to configure it to try to write to the SD card under KitKat. I said yes - and suddenly I cannot access the drive at all.
Android Version 4.4.2
Kernel Version 3.4.39-1462259
Build Number: KOT49H.P600UECNK1
SE for Android Status Enforcing SEPF_SM-P600_4.4.2_0032
The SD card is a Sandisk 128GB.
I haven't tried flashing another ROM because I also need S-Pen and Chromecast functionality - so I just didn't want to fool with it.
1. Does anyone have any suggestions to get SD card RW access?
2. If "No" to the above, what is a good stock ROM with S-Pen and Chromecast functionality that has already addressed the SD issue that I can flash (and where is it located)?
Thank you all for your help.

Have you tried manually editing /system/etc/permissions/platform.xml?
Find this section:
Code:
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
</permission>
And change it to this:
Code:
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
[B][COLOR=Blue]<group gid="media_rw" />[/COLOR][/B]
</permission>
Check permissions on platform.xml after editing and fix if needed. Reboot.

blindmanpb said:
Have you tried manually editing /system/etc/permissions/platform.xml?
Click to expand...
Click to collapse
[SNIP]
Yes - I checked SDFix after running it, and platform.xml had already been correctly edited. Thanks for the suggestion though.

Have you tested this SD card in other devices, and other SD cards in this device?

Caveman6 said:
Hi,
I hope someone has suggestions on the following issue. I've searched threads, but haven't found this specifically.
I need the ability to R/W with multiple programs to my SD card. Due to work and also teaching concerns, I need to access directories of ebooks, articles and databases that are large and in the past were synced from the cloud to my device. Obviously KitKat makes an issue of this.
I recently obtained a Samsung Galaxy Note 10.1 2014 P600. Refurbished by the manufacturer. This has only a one-month warranty so rooting wasn't a concern.
1. I rooted the device using CF Autoroot. Rooting was confirmed by Root Checker.
2. I ran SDFix. No joy. Access to the SD card was sporadic - for example - music on the card would only play 2 seconds of each song.
Edit: This ROM would be a good fit for you it has all of the stock features plus some also the ability to read and write to the SD card. http://forum.xda-developers.com/showthread.php?t=2793898
3. Using Titanium Backup, I froze all Knox-related programs (this was more than the list of 6 I think. I can provide a list later.) Later, I also backed-up and deleted the programs.
Access to the SD card was still sporadic. After a reboot, I might have access for a few minutes, and then restricted access again.
4. I then tried Xposed Framework and the "Handle External Storage" module (see the 3rd method in this article http://technofaq.org/posts/2014/04/fixing-external-sd-card-write-issue-on-android-kitkat/). This worked but still had issues - I had drive access but from time to time it would disappear - it would seem to randomly unmount.
5. But, I decide to keep trying and in the process went to create a folder with File Explorer. FX gave me a message about KitKat - and asked if I wanted to configure it to try to write to the SD card under KitKat. I said yes - and suddenly I cannot access the drive at all.
Android Version 4.4.2
Kernel Version 3.4.39-1462259
Build Number: KOT49H.P600UECNK1
SE for Android Status Enforcing SEPF_SM-P600_4.4.2_0032
The SD card is a Sandisk 128GB.
I haven't tried flashing another ROM because I also need S-Pen and Chromecast functionality - so I just didn't want to fool with it.
1. Does anyone have any suggestions to get SD card RW access?
2. If "No" to the above, what is a good stock ROM with S-Pen and Chromecast functionality that has already addressed the SD issue that I can flash (and where is it located)?
Thank you all for your help.
Click to expand...
Click to collapse
Take a look at this thread http://forum.xda-developers.com/showthread.php?t=2741914. It looks like 128Gb SD card only works with 4.3
Edit: Try this ROM it should have RW to SD card. Along with S-Pen and Chromecast ability because it is stock based.
http://forum.xda-developers.com/showthread.php?t=2793898
Sent from my SM-P600 using XDA Free mobile app

Thank you for the prior comments. Due to work and the holidays I wasn't able to reply prior to now.
It turns out the issue was my attempt at using a 128GB card- the Samsung Note 10.1 2014 can apparently only handle up to a 64GB card.
Out of curiosity, has anyone found a way to root and reset KNOX to 0?

Orion116 said:
Take a look at this thread http://forum.xda-developers.com/showthread.php?t=2741914. It looks like 128Gb SD card only works with 4.3
Edit: Try this ROM it should have RW to SD card. Along with S-Pen and Chromecast ability because it is stock based.
http://forum.xda-developers.com/showthread.php?t=2793898
Sent from my SM-P600 using XDA Free mobile app
Click to expand...
Click to collapse
128GB cards do not work with 4.3. I have 4.3 and have tested four different Sandisk 128gb cards in fat32 and Exfat and no luck. Only 64gb works with 4.3 and this was confirmed with Best Buy demo units as well (pre 4.4 update of the demos course).

Caveman6 said:
Thank you for the prior comments. Due to work and the holidays I wasn't able to reply prior to now.
It turns out the issue was my attempt at using a 128GB card- the Samsung Note 10.1 2014 can apparently only handle up to a 64GB card.
Out of curiosity, has anyone found a way to root and reset KNOX to 0?
Click to expand...
Click to collapse
from what I know and read once knox is tripped you cant reset it. I think you can root without tripping it but just cant reset it.

It's a one-way trip!
mikep2323 said:
from what I know and read once knox is tripped you cant reset it. I think you can root without tripping it but just cant reset it.
Click to expand...
Click to collapse
Right! The problem is that "tripping" knox actually changes the hardware. It burns out a fusible link which, of course, can't be un-burnt.

Caveman6 said:
Thank you for the prior comments. Due to work and the holidays I wasn't able to reply prior to now.
It turns out the issue was my attempt at using a 128GB card- the Samsung Note 10.1 2014 can apparently only handle up to a 64GB card.
Out of curiosity, has anyone found a way to root and reset KNOX to 0?
Click to expand...
Click to collapse
Good news! The issue I was having was with the SPECIFIC 128 GB card. I tried a PNY 128GB card instead, and it is working perfectly.

[Q] Lost access to SD card after Lollipop upgrade

Upgraded from KK to Lollipop recently. Running fine, rooted, and with sleek kernel.
I left my 64gb SD card in while doing this and now I cannot access it.
The OS sees it and can erase it, but that's about it. When I try to mount it, it fails (with no error message).
Any suggestions on how to resolve please?

techinv said:
Upgraded from KK to Lollipop recently. Running fine, rooted, and with sleek kernel.
I left my 64gb SD card in while doing this and now I cannot access it.
The OS sees it and can erase it, but that's about it. When I try to mount it, it fails (with no error message).
Any suggestions on how to resolve please?
Click to expand...
Click to collapse
No problem. You need to add a line to the /etc/permissions/platform.XML.
It is the media line. Use Root Browser, open the file, write in the third line designated, save, enjoy
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
---------- Post added at 05:20 PM ---------- Previous post was at 05:03 PM ----------
sleekmason said:
No problem. You need to add a line to the /etc/permissions/platform.XML.
It is the media line. Use Root Browser, open the file, write in the third line designated, save, enjoy
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
Click to expand...
Click to collapse
oh, and glad to see you using my kernel! I updated for sound control today as well. Flash new kernel in recovery.

sleekmason said:
No problem. You need to add a line to the /etc/permissions/platform.XML.
It is the media line. Use Root Browser, open the file, write in the third line designated, save, enjoy
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
---------- Post added at 05:20 PM ---------- Previous post was at 05:03 PM ----------
oh, and glad to see you using my kernel! I updated for sound control today as well. Flash new kernel in recovery.
Click to expand...
Click to collapse
Thanks very much sleek, for the answer and the update on the kernel. Downloading now!

sleekmason said:
No problem. You need to add a line to the /etc/permissions/platform.XML.
It is the media line. Use Root Browser, open the file, write in the third line designated, save, enjoy
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
Sleek, my platform.xml already has those lines exactly as listed above for the WRITE_EXTERNAL_STORAGE permission. If it matters, the READ_EXTERNAL_STORAGE only has <group gid="sdcard_r" />
Click to expand...
Click to collapse

techinv said:
sleekmason said:
No problem. You need to add a line to the /etc/permissions/platform.XML.
It is the media line. Use Root Browser, open the file, write in the third line designated, save, enjoy
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
Sleek, my platform.xml already has those lines exactly as listed above for the WRITE_EXTERNAL_STORAGE permission. If it matters, the READ_EXTERNAL_STORAGE only has <group gid="sdcard_r" />
Click to expand...
Click to collapse
Huh, I was having the same problem and the above fixed it just fine. But, why would you already have that line if you switched to Lollipop..? Strange. What file Explorer do you use?
---------- Post added at 08:49 PM ---------- Previous post was at 08:43 PM ----------
techinv said:
sleekmason said:
No problem. You need to add a line to the /etc/permissions/platform.XML.
It is the media line. Use Root Browser, open the file, write in the third line designated, save, enjoy
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
Sleek, my platform.xml already has those lines exactly as listed above for the WRITE_EXTERNAL_STORAGE permission. If it matters, the READ_EXTERNAL_STORAGE only has <group gid="sdcard_r" />
Click to expand...
Click to collapse
is your card a SanDisk? There have been problems with SanDisk 64 cards.
Click to expand...
Click to collapse
Click to expand...
Click to collapse

sleekmason said:
techinv said:
Huh, I was having the same problem and the above fixed it just fine. But, why would you already have that line if you switched to Lollipop..? Strange. What file Explorer do you use?
Not sure why the lines are there, but they are definitely there. I did notice that there was a platform.XML.bak in the same directory. I'm not sure what differences are there between the 2 files. I'm using ES File Explorer with root explorer functionality turned on.
---------- Post added at 08:49 PM ---------- Previous post was at 08:43 PM ----------
techinv said:
is your card a SanDisk? There have been problems with SanDisk 64 cards.
Click to expand...
Click to collapse
Yep, it is a SanDisk 64, but I've been using it with this tablet for almost a year without any problems.
Click to expand...
Click to collapse
Click to expand...
Click to collapse

techinv said:
sleekmason said:
techinv said:
Huh, I was having the same problem and the above fixed it just fine. But, why would you already have that line if you switched to Lollipop..? Strange. What file Explorer do you use?
Not sure why the lines are there, but they are definitely there. I did notice that there was a platform.XML.bak in the same directory. I'm not sure what differences are there between the 2 files. I'm using ES File Explorer with root explorer functionality turned on.
---------- Post added at 08:49 PM ---------- Previous post was at 08:43 PM ----------
Yep, it is a SanDisk 64, but I've been using it with this tablet for almost a year without any problems.
Click to expand...
Click to collapse
Give Root Browser a shot. I switched over to Root Browser after problems with ES.
Click to expand...
Click to collapse
Click to expand...
Click to collapse

sleekmason said:
techinv said:
sleekmason said:
Give Root Browser a shot. I switched over to Root Browser after problems with ES.
Click to expand...
Click to collapse
Installed root browser, checked the file, but I don't see any differences so here is what I tried anyway.
Made a bogus edit to the file and saved it, rebooted, no change.
Booted into recovery, wiped the micro_sd card, rebooted, no change.
Erased the card through, settings -> storage, no change.
The OS cannot mount the card. It seems like it tries to when I touch the command (I see an icon for about a half second in the status bar), but it fails and there is no error message that I can see.
I'm beginning to think that this card is toasted and that maybe I should buy another one (but not SanDisk).....
Click to expand...
Click to collapse
Click to expand...
Click to collapse

techinv said:
sleekmason said:
techinv said:
Installed root browser, checked the file, but I don't see any differences so here is what I tried anyway.
Made a bogus edit to the file and saved it, rebooted, no change.
Booted into recovery, wiped the micro_sd card, rebooted, no change.
Erased the card through, settings -> storage, no change.
The OS cannot mount the card. It seems like it tries to when I touch the command (I see an icon for about a half second in the status bar), but it fails and there is no error message that I can see.
I'm beginning to think that this card is toasted and that maybe I should buy another one (but not SanDisk).....
Click to expand...
Click to collapse
Do you have one just to check With? Maybe in your phone or camera?
Click to expand...
Click to collapse
Click to expand...
Click to collapse

sleekmason said:
techinv said:
sleekmason said:
Do you have one just to check With? Maybe in your phone or camera?
Click to expand...
Click to collapse
Good idea, will look and see what I can find. Getting late here so will do more with this tomorrow.
Thanks again for the suggestions.
Click to expand...
Click to collapse
Click to expand...
Click to collapse

Found a 32gb SanDisk card and it worked right away in my G Pad, so I guess that confirms that the 64gb one stopped working somewhere during the upgrade to Lollipop. Sort of sucks, but at least I know.....

LG G Pad SD Card problems
Hi, I am having the same issue with SD Cards (3 - 2-64gb and 1-16gb). I just purchased two G Pad 8.3's, one for my son and one for me. I also purchased two Samsung EVO Micro SDXC 64GB cards to use with the Tablets. I immediately updated the OS from 4.2.2 to 4.4.2 KK and everything seemed fine. I did have one problem that I attributed to the SD Card, my Tablet popped up a msg stating that the SD Card was not accessible and I need to Format it. I tried to Format from within the Tablet and it didn't work, I still couldn't mount it or access it. So I removed it and put it in a little card reader and ran a Complete Format in exFat32 and it worked because I then installed it in the Tablet and it was visible and accessible, so I removed it and tried it in the second Tablet and it seemed fine, for a couple hours. I added some music and videos from my PC and again it seemed fine. But somewhere along the line the SD card is kicked out of the format and becomes Un-Formatted. So I am thinking all you need do is remove the card from the Tablet and do a Full Format on a PC, Windows 7 defaults to exFat32 for the 64GB SDXC card and Fat32 for the 16gb SDHC card and they then appear to be perfectly normal. I don't think the Cards are permanently ruined, even though the Tablet will not access the card until a re-format. What I need to know is why are TWO new Tablets BOTH doing this to TWO NEW SDXC Cards and one SDHC 16gb card that I have had for a long time which has been reliable and Stable until now. Are there other instances of this taking place using KitKat? Is it possible that the Tablets are BOTH Defective? or is it something in the OS that is corrupting the cards, but still allowing me to reformat outside of the Tablet in a card reader? Any Feedback would be appreciated. And it sounds like your card is still serviceable if you do a full format outside of the Tablet, Oh and I am not sure but it seems like the problems begin AFTER the Tablet shuts down and reboots although I am not positive about that. Again, any help is welcome, I need to either resolve this soon or I have to return the Tablets before the window for returning them expires. Sorry for the length of this post.... Dan

I think your problem is related to what base your firmware is. There have been many sdcard problems with official stock 4.4.2 firmware. Try going back to 4.2.2.

Arrrghgh!! I was havoing the same problem after installing the new recovery.
THE ANSWER IS.... while in recovery, goto mount, and mount the damn sdcard!!! Took me a few to figure it out. Jeez.

You must also make sure your sdcard is formatted as fat32 and not exfat. If you format the sdcard in CWM, then it should be the correct format and you will have much less trouble with strange unmounts.
Exfat will appear to work, but it will give you problems.

Locking method?
I can't post links yet, so here is my entire post from androidcentral:
Galaxy S5 - Tmobile - SD 16gb
My SD card was working fine shortly after the upgrade to Lollipop until I did the first restart: the card was no longer recognized. I thought the problem could be with the card, so I backed it up using my laptop (yes, it was readable from the laptop) and did a full format in FAT32. Still no luck. Then, out of nothing, I decided to unlock the phone using the backup password instead of my finger print: immediately I saw in the top of the phone the message "preparing SD card" and it was recognized by the phone. I repeated the test: restarted the phone and unlocked it using the finger print: SD card not available. Then locked the phone and unlocked it using the backup password: the card was recognized. Since then I'm not using any locking method for my phone (will try other methods later).
Has anyone gone through something similar?

"Download Failed" on Download Manager -- SD Card Permissions Issue?

I've had this issue for a while since installing NB4 rooted on my phone. Can't seem to get downloads from Chrome (or any other browser) to save to my device.
Also having a weird and possibly related issue with my camera apps (Google Camera and Camera Zoom FX), neither is saving any image captures. Camera Zoom is returning "Error Code 2" pertaining to my SD card.
I fear this may be a SD card permissions bug that I triggered when trying to troubleshoot a nandroid restore issue via doing a "Fix SD Card Permissions".
I've tried the platform.xml fix for <group gid="media_rw" />.
Trying to avoid starting fresh...help please?
Thank you in advance for your feedback.

Bump.
Has anyone come across this issue?