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I recently saw that my 2GB SanDisk microSD card was mounting as read-only filesystem on my linux (Ubuntu 10.10). I tried changing its property through nautilus, but it went in vain.

Also I tried manually editing /etc/mtab file where I edited "ro" option to "rw", but when the flash-drive was again inserted, it was mounted as read-only.

Can anyone tell me how I can remove this write-protect property of this filesystem to read-write in linux?

freax
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2 Answers2

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Full sized SD cards have a write protect switch.

I do not have a microSD card here to see if they also have one. But it is worth checking. If you are using a microSD to SD convertor then also check that.

Hennes
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Try 

sudo mount -o remount,rw /wherever/card/is/mounted
Janne Pikkarainen
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  • I already tried that and got the following mount error: **mount: cannot remount block device /dev/sdb read-write, is write-protected** . Also I tried formatting the filesystem to FAT32 using **mkfs** and with **gparted** but in vain – freax May 23 '12 at 10:18
  • are there any messages in `dmesg` when plugging it in? – krissi May 23 '12 at 11:49
  • @krissi yes, as I have said I got write-protect is on when I did a dmesg as **[19686.432282] sd 13:0:0:0: [sdb] Write Protect is on** – freax May 23 '12 at 12:00
  • Can be a hardware switch, see answer of @Hennes – hayalci May 23 '12 at 21:22