Device always connects to my PC as a "read-only" device.

[betoqp]

I have a Sansa e280 v2, and I'm connecting to Linux Mint Nadia (14).

When I connect my sansa, I can't add or delete music. It displays various errors (one per app I try to use) regarding it being a "read-only disk/device". I have tried Banshee, Clementine and the File Manager. Last week I managed to add about 10 songs by putting them on the clipboard, connecting the device and quickly (seconds from connecting) pasting them in a folder within the Music folder.
About 1:30-2:00 min after connecting it, it becomes read-only. I've never had this issue before. Granted, I hadn't used my Sansa in about 5 months (it already had Rockbox installed). I tried re-installing the firmware and the error persists. Any idea of how I can fix this? Thanks!

[saratoga]

Usually linux mounts a corrupted file system as read only.  Check the file system for errors.

[betoqp]

How do I do that?

[nick_p]

You'll need to find out what device it's mounted as, then unmount it if it's mounted.

Replace my sdX with what you find in /var/log/syslog or /var/log/messages when you plug it in.

umount /dev/sdX
dosfsck -a -w -v /dev/sdX

Edit: It might be an idea to boot into the original Sansa firmware before plugging it in, USB is pretty unstable on AS3525 targets at the moment.