Ricky Bruce wrote:
Did the disk come from a Dell laptop?
No, it's a 3.5" IDE from a Compaq PC. The tests I've done with it (other than via USB adapter) have been done in the same PC it came from.
If so your sister may have set up a hdd password, which is set independently of the bios password. It will lock the disk contents unless it is sucessfully entered and would result in the disk looking empty to things like GParted.
Although not the case here for the reasons above, that's interesting to know so thanks for that.