Welcome to the Android Central Forums Create Your Account or Ask a Question Answers in 5 minutes - no registration required!
Page 1 of 2 12 LastLast
Results 1 to 25 of 40
Like Tree5Likes
  1. Thread Author  Thread Author    #1  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default SD Card Unmounting Itself

    Morning everyone,

    I'm running JB 4.1 rooted but without any customization. Starting this morning, my 32gb sd card started to randomly unmount itself. The only solution is to remove the card and reinsert it to get the phone to recognize that it is present.

    I removed the card and inserted it into my laptop to see if there was anything odd about the files. I scanned it using Avast and no threats were found. I did download a .rar file last night from androidcentral for fonts, however, I have since deleted it, suspecting that file may have had something to do with it. Unfortunately, I still have the problem. I also deleted a folder that showed that it had been created minutes before I noticed this problem. Explorer showed it as empty and Avast indicated it posed no threat.

    Any help would be appreciated. Thanks.
  2. #2  

    Default Re: SD Card Unmounting Itself

    Slap that sucker (SD card) into your PC and remove all contents. Format the sucker in Fat32 and then replace all your contents back on it. Now put the little booger back into your phone. Try that. Sometimes SD cards lose it's file structure causing your exact problem.
    Thanked by 2:
    rseifer likes this.
  3. #3  

    Default Re: SD Card Unmounting Itself

    Had that issue once after dropping my phone (onto carpet; it just got jarred). Wouldn't stop happening until I reformatted the card.
    Thanked by:
  4. Thread Author  Thread Author    #4  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default Re: SD Card Unmounting Itself

    Thanks for the info. I will do just that tomorrow and give account of what happens

    sent via smoke signals
  5. #5  
    Skunkape60's Avatar
    Retired Ambassador

    Posts
    4,518 Posts

    Default Re: SD Card Unmounting Itself

    Quote Originally Posted by BrockS. View Post
    Thanks for the info. I will do just that tomorrow and give account of what happens

    sent via smoke signals
    Try this thread...
    Will the SD card ever work? Please help a fellow user.
    http://forums.androidcentral.com/signaturepics/sigpic70132_2.gif
    Thanked by 2:
  6. #6  

    Default Re: SD Card Unmounting Itself

    You are a super-helpful guy, Skunkape60. I'm making some positive progress with your advice among other peoples'.

    I've also had this problem where the card unmounts itself. I've found this to be the case when I use a card that has had data transferred to it while outside of the phone. Inserting it back into the device has been liable to slow down my phone (home screen chugs), and eventually give me back reports on how it is "damaged" if it shows up at all as an SD card. Specifically, I am referring to a FAT32 card in the previous sentence. The same card formatted in it's original exfat system will simply tell me that it is always damaged if I transfer data into it the same way.
  7. #7  

    Default Re: SD Card Unmounting Itself

    Yeah but there are so many factors that can make what you describe happen. I have always...ALWAYS...taken out my SD card from my S3 (that is formatted in Fat32) to transfer large files to and from and have never experienced what you (and others) describe. Usually when I start getting errors, random reboots and disconnects, the card is about to fail. I had 2 A-Data 32GB class 10 micro SD cards go bad on me that were only a month old. It happens. I got them replaced but now I use Samsung 32GB class 10 micro SD cards for my S3 and my Samsung Chronos Series 7 and have not had a hiccup.
  8. Thread Author  Thread Author    #8  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default Re: SD Card Unmounting Itself

    Just to update, I tried wiping and reformatting and it seemed to work for a while, but now I getting the "sd card unexpectedly unmounted" message again. It is less frquent than when thjs first started up. I will look through the thread skunkape suggested and see what can be had.

    Once again thanks to all who have offered direction

    sent via smoke signals
  9. Thread Author  Thread Author    #9  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default Re: SD Card Unmounting Itself

    Quote Originally Posted by wilder_jw View Post
    Had that issue once after dropping my phone (onto carpet; it just got jarred). Wouldn't stop happening until I reformatted the card.
    I believe the very same occurred with me only reformatting isn't doing the trick.

    sent via smoke signals
  10. Thread Author  Thread Author    #10  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default Re: SD Card Unmounting Itself

    Quote Originally Posted by Webnaut View Post
    You are a super-helpful guy, Skunkape60. I'm making some positive progress with your advice among other peoples'.

    I've also had this problem where the card unmounts itself. I've found this to be the case when I use a card that has had data transferred to it while outside of the phone. Inserting it back into the device has been liable to slow down my phone (home screen chugs), and eventually give me back reports on how it is "damaged" if it shows up at all as an SD card. Specifically, I am referring to a FAT32 card in the previous sentence. The same card formatted in it's original exfat system will simply tell me that it is always damaged if I transfer data into it the same way.
    Hmmm I leave it in the phone to do transfers of all sizes, I have an otterbox commuter case on it which is a bit of a pain to take off and reapply. I have only gotten the "damaged" message once, if I recall correctly, and that was following removal and re insertion of the card in question shortly after this started.

    sent via smoke signals
  11. #11  

    Default Re: SD Card Unmounting Itself

    Any further ideas on this point? I have a Verizon S3 with a 64 GB card in it that seems to randomly unmount itself. If I go into the Storage Options, manually unmount/remount it comes back fine.

    However, I'm leery about reformatting... When I bought the phone a month ago, I tried formatting to FAT32 via a laptop (Windows 7 Pro), but the laptop only saw the chip as 32GB, so I didn't proceed. Don't know if I need newer drivers or what, but I didn't feel it worth the risk to destroy a new 64GB chip.
  12. #12  

    Default Re: SD Card Unmounting Itself

    I have the same problem with my lenovo p770 jb 4.1 and I saw in some forums that it's jb 4.1 bug where Google play
    If you install app on sd card does it remove all the apps after reboot?
  13. #13  

    Default Re: SD Card Unmounting Itself

    had this problem also. formatting the sd card didnt help. stick a piece in there to make a tighter contact against the phone, worked for me.
  14. #14  

    Default Re: SD Card Unmounting Itself

    If the card is a Sandisk or a PNY check out this thread SD card removed unexpectedly error - Galaxy S3 Discussion - TeamUSCellular
    Vicxy likes this.
  15. #15  
    Golfdriver97's Avatar

    Posts
    21,754 Posts
    Global Posts
    22,194 Global Posts
    ROM
    Liquidsmooth ROM

    Default Re: SD Card Unmounting Itself

    I was talking with a Samsung representative online a few weeks ago, and they told me that while the S3 can support a 64GB SD card, it cannot support the SDXC type of cards. I have used SDHC cards and have had no problem with them.

    Phone Timeline
    'If we could change ourselves, the tendencies in the world would also change.' - Mahatma Gandhi
    Community Guidelines and also here
  16. #16  

    Default Re: SD Card Unmounting Itself

    On my 64 gb SDXC microSD I removed the extra partition, long reformatted from exFat to Fat32 and then let the phone re-format it again.So far it's been working flawlessly. (I probably just jinxed myself)
  17. #17  

    Default Re: SD Card Unmounting Itself

    Does the card unmount while sitting on a table / not moving etc? I ask this, as my card has been un mounting, but its been related to jarring and physical hits (nothing I would call abusive).
    I've inserted a sliver of business card between the SD card and the metal frame (frame closest to rear cover), and it seems to have stopped unmounting.
  18. #18  
    mcaples's Avatar

    Posts
    125 Posts
    Global Posts
    642 Global Posts

    Default Re: SD Card Unmounting Itself

    I had my original card unmount itself. Bought a new one, and I put it in the phone (straight from the package) and it said "SD ready to be removed"...tryed to formate...card said "card blank or has unsupported systemfiles"...tried the sequence of events after a factory reset...TRIED AND TRIED...SAME THING...since I dont have a PC I cant (and dont even know what it is) do the Fat32 thing...I may try sticking a piece of paper in...I like "stupid" fixes...HA!!!!!
    Sent from my GS3 w/JB
  19. Thread Author  Thread Author    #19  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default Re: SD Card Unmounting Itself

    Quote Originally Posted by thefatstig View Post
    Does the card unmount while sitting on a table / not moving etc? I ask this, as my card has been un mounting, but its been related to jarring and physical hits (nothing I would call abusive).
    I've inserted a sliver of business card between the SD card and the metal frame (frame closest to rear cover), and it seems to have stopped unmounting.
    Yeah, I could have it siting on my desk and it would unmount randomly. I have since been using an 8GB card I had in my BB 9650 without any problems. The 32GB I had the issue with does not appear to want to be recognized by any devices any longer. I'm still not sure if the phone caused the initial problem and it is beyond repair or if it was the card to begin with. Too many instances of this issue with other folks for me to say.
  20. Thread Author  Thread Author    #20  
    BrockS.'s Avatar

    Posts
    27 Posts
    Global Posts
    57 Global Posts

    Default Re: SD Card Unmounting Itself

    Just came across this on XDA while looking for something else, it appears SanDisk is the problem.

    Samsung Galaxy S3 fault is caused by SanDisk memory cards | CNET UK
  21. #21  

    Default Re: SD Card Unmounting Itself

    I have an Acer iconia tab a210 with android 4.1 JB.
    I just started using a PNY 32 GB external SDHC card. This card frequently unmounts itself (ca 50 times per 24h). Then I tried a 8 GB SD card.
    This card does function without any dismounts! Therefore I went back to the shop and received a new PNY 32 GB card. Unfortunately this card also frequently unmounts itself... So now I am lossed. Probably an issue of JB with large SDHC cards.
  22. #22  

    Default Re: SD Card Unmounting Itself

  23. #23  

    Default Re: SD Card Unmounting Itself

    Having the same problem over and over again with 8 Gb Samsung Cl.4 SD and 32 Gb Adata Cl.4 SD. Sometimes after unmounted/damaged/etc. not working SD in Phone will work on computer or aren't being recognized at all. In Windows or other devices the card is than dead.

    However so far with only the program Gparted in Gnu/Linux or the live-cd you can unmount the partition of the SD and repair the SD. The prblem here every time is: FILESYSTEM NEEDS TO BE ENLARGED TO FILL PARTITION COMPLETELY. After that repair the SD's work again every time. Only my Phone does the corrupting of filesystem SD-card, the cards never have problem in other devices.

    Could there be the problem ?

    Gparted report in Dutch:

    Bestandssysteem (fat32) op /dev/sdb1 controleren en repareren 00:01:35 ( GESLAAGD )

    /dev/sdb1 kalibreren 00:00:00 ( GESLAAGD )

    pad: /dev/sdb1
    begin: 2048
    eind: 62332927
    grootte: 62330880 (29.72 GiB)


    bestandssysteem op /dev/sdb1 controleren op fouten en deze (indien mogelijk) repareren 00:00:08 ( GESLAAGD )

    dosfsck -a -w -v /dev/sdb1

    dosfsck 3.0.12 (29 Oct 2011)
    dosfsck 3.0.12, 29 Oct 2011, FAT32, LFN
    Checking we can access the last sector of the filesystem
    Boot sector contents:
    System ID "mkdosfs"
    Media byte 0xf8 (hard disk)
    512 bytes per logical sector
    16384 bytes per cluster
    32 reserved sectors
    First FAT starts at byte 16384 (sector 32)
    2 FATs, 32 bit entries
    7798784 bytes per FAT (= 15232 sectors)
    Root directory start at cluster 2 (arbitrary size)
    Data area starts at byte 15613952 (sector 30496)
    1946887 data clusters (31897796608 bytes)
    32 sectors/track, 64 heads
    0 hidden sectors
    62330880 sectors total
    Reclaiming unconnected clusters.
    Checking free cluster summary.
    /dev/sdb1: 12615 files, 495884/1946887 clusters


    bestandssysteem vergroten tot de partitie geheel is opgevuld 00:01:27 ( GESLAAGD )

    met gebruik van libparted
  24. #24  

    Default Re: SD Card Unmounting Itself

    hi.. just wanna know if we have fix with this so far?

    mine is already in FAT32 but SD card still unmounting itself from my phone.

    i have sandisk ultra UHS-1 32G class 10 with a speed of upto 30MB/s..

    is it really true that its a bug from sandisk with the ROM JB 4.1 and 4.2?
  25. #25  

    Default Re: SD Card Unmounting Itself

    Hi I read most of post on here and had the same problem. So, i went with the basic advise and shoved a piece of small cut busines card on the top end of the sd card. Its working like a charm. I have the samsung infuse 4g and using a 32gb sd card. I believe the problem is in the mounting housing of the phone. Afterwards, my boot up time was drastically faster as well. Hope this helps. I dont think any of the files are corrupt, just the space which holds the card in place. Just make sure u make the piece of paper long enough to pull it out when you want to remove the card on your own. Trust me, this was driving me to the point of getting a new phone.
Page 1 of 2 12 LastLast

Similar Threads

  1. Phone rebooting? SD card unmounts randomly?
    By etnpnys in forum AT&T Samsung Infuse
    Replies: 1
    Last Post: 11-08-2011, 12:31 PM
  2. Sd card unmounting
    By LdotAdot13 in forum Verizon HTC Thunderbolt
    Replies: 10
    Last Post: 07-13-2011, 05:15 PM
  3. SD card unmounts and/or disappears with USB cable
    By attweco in forum AT&T ATRIX
    Replies: 9
    Last Post: 06-29-2011, 01:12 AM
  4. Sd card unmounted?
    By ChezDigital in forum Verizon HTC Thunderbolt
    Replies: 4
    Last Post: 06-04-2011, 01:04 PM
  5. sd card unmounts when i connect it to cpu via usb
    By omarnova in forum LG Optimus S
    Replies: 5
    Last Post: 03-29-2011, 12:56 PM

Posting Permissions