Flash drive is suddenly read-only.

view full story

http://crunchbanglinux.org – I'm not sure what happened, but when I plugged in my flash drive this morning (4gb, HP brand), I deleted some files from it and tried to move another to it. Halfway through the copy/paste process, I would get an I/O Error and the transfer wouldn't  finish. So I ejected and re-mounted the flash drive and now it's read-only. Any idea what happened? (HowTos)