HardDisk Sentinel let me know I had a faulty drive, so I backed up my info in time. Then I decided to toy with this program as it offers to fix issues. Site is in Russian, it can be downloaded from MajorGeek. As intimidating as Victoria looks, it has an "Easy Button".. Test & Repair was findable. Took an hour for a 320GB, but in the end, though it told me there were 2 cyclic redundancy check errors, it neither fixed them nor gave further direction. Maybe someone who is more of a pro could do more.