>> I was more interested in what the error means ;-)
Faulty sector or cluster on hard disk that Seagate couldn't read. Depending on what you've done either Seagate or chkdsk has replaced it with another sector/cluster or marked that area unusable.
>> Is it likely to re occur?
Don't know. Hard disks will get faults on them. You might get one or two with age. You might not. It's when they suddenly start spreading is the problem. Just keep an eye on the disk and make sure all data is backed up elsewhere.
Run the Seagate Tools a couple of times of year and see what happens.
