External harddrive Cyclic Redundancy Check (CRC) error
i recently took my external harddrive (hitachi 320gb) to a friends house, where it was accidently dropped approximately 1.2m from a table to a wooden floor (when it was turned on and running). it seemed fine for the next 3-4 days, then this morning it had trouble turning on. (i.e. i had to flick the switch a few times and disconnect and reconnect the power cable). So i decided i'd back up all my files just in case this was a sign of a failing harddrive, as it was dropped. Thing is, while copying my files onto the computer, several (around 3-4 so far) has had CRC errors and i couldnt copy em.
What could this mean? should i just backup all the files i can (those not affected by the CRC error), reformat the harddrive, and keep using it? or should i buy a new one in case it suddenly goes dead?