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Old 08-28-2013, 03:42 PM   #1
TwinReverb
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Location: Misawa AB, Japan
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My Computer Eats MicroSDs


I'm posting this because it's baffled me and I can't figure it out.

I bought a brand new Sandisk MicroSD for my Samsung Galaxy Tab 2 7.0. I use Windows 7/OpenSuSE 12.3 on my Dell laptop. I have an A+ certification.

The card was working fine in the tablet. I took it out, tried using rsync to update it through an ioGear micro-SD reader. In the USB 3.0 slot, rsync starts behaving like the card has problems, i/o error, etc.

Pull it out, put it in the USB 2.0 slot, same thing, though it mounts fine and I can see the directories on it.

Rsync my data to my windows folder, reboot into Windows. Can't write to the card. Format the card, then copy my stuff to it through the adapter in the USB 2.0 port. Stop the copy process and correctly unmount it to move the card to the USB 3.0 port. Then it won't let me. Format the card again, still won't let me.

Go back to Linux, dd if=/dev/zero of=/dev/sdb bs=512 count=1 to start it over. Put card into tablet, format it. Take card out, put in reader in USB 2.0 port. Initially seems to be working, so I copy all my stuff to it. Wake up the next day and it's done (32GB card). Properly unmount and remove. Put in tablet, tablet claims it's damaged.

I can't narrow down what the heck is going on because I'm getting mixed signals here.

I also can't connect the tablet to use it as a reader for the card because for some reason OpenSUSE doesn't have the drivers to use the tablet or something.

Please tell me if you happen to know what's causing this. I can furnish additional information upon request. Thanks!
 
Old 08-28-2013, 03:51 PM   #2
TB0ne
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Quote:
Originally Posted by TwinReverb View Post
I'm posting this because it's baffled me and I can't figure it out.
I bought a brand new Sandisk MicroSD for my Samsung Galaxy Tab 2 7.0. I use Windows 7/OpenSuSE 12.3 on my Dell laptop. I have an A+ certification.

The card was working fine in the tablet. I took it out, tried using rsync to update it through an ioGear micro-SD reader. In the USB 3.0 slot, rsync starts behaving like the card has problems, i/o error, etc. Pull it out, put it in the USB 2.0 slot, same thing, though it mounts fine and I can see the directories on it.

Rsync my data to my windows folder, reboot into Windows. Can't write to the card. Format the card, then copy my stuff to it through the adapter in the USB 2.0 port. Stop the copy process and correctly unmount it to move the card to the USB 3.0 port. Then it won't let me. Format the card again, still won't let me.

Go back to Linux, dd if=/dev/zero of=/dev/sdb bs=512 count=1 to start it over. Put card into tablet, format it. Take card out, put in reader in USB 2.0 port. Initially seems to be working, so I copy all my stuff to it. Wake up the next day and it's done (32GB card). Properly unmount and remove. Put in tablet, tablet claims it's damaged.

I can't narrow down what the heck is going on because I'm getting mixed signals here. I also can't connect the tablet to use it as a reader for the card because for some reason OpenSUSE doesn't have the drivers to use the tablet or something.
I have almost the exact same setup...a Galaxy Tab 2 7.0 and openSUSE 12.3, and *DID* have problems with the SDHC card. Turns out the sandisk card was flaky, and would SOMETIMES work (and sometimes NOT), and finally died totally. Had to purchase a new one (different vendor), and it works fine. Had three sandisk cards go bad (two microsd's and a standard-size), and replacing them 'fixed' it. Don't know if they don't play nicely with Android, or if there's another issue.

Wish I could offer more help, but I don't think there's much else to do.
 
Old 08-28-2013, 06:58 PM   #3
dt64
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Sometimes they just die.

Had a few, normal size and micro. They work ok for some time, sometimes days, sometimes month, and all of a sudden they stop working, sometimes completely, sometime with behaviours like TwinReverb said. Some for cheaper USB keys.

Don't worry too much. Have backups. They don't cost a fortune -> just get a new one.

Interesting is: I never had that with standard capacity SD cards (<=4GB). All I ever had are still working, but more or less useless (I still have a few 64MB cards, anybody interested?)
 
Old 08-30-2013, 10:12 PM   #4
TwinReverb
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Registered: Sep 2008
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Original Poster
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Yep same thing. Put it into my tablet, format, it works. Copy everything back using otg cable and usb stick, when it gets over 75% full it stops working upon reboot. Seriously considering 32gb usb stick and otg cable from now on.
 
  


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