If you have Indexing Service turned off for the drive, Seatools diagnostics will report errors with the file system. I discovered this little bug over a year ago running Seatools on 4 Seagate drives, all of which are working fine today.
I experimented a bit with the Seagate SATA and PATA drives in my system. I could zero a drive, then initialize and format it, and a subsequent Seatools diagnostic scan would report no errors. If I then turned off indexing, Seatools reported errors with the file system. After booting the system, Seatools reported the errors as critical errors. If I then turned indexing on for the drive and rebooted the system, Seatools reported no problems with the drive.
On the other hand, you may indeed have issues with your drive. You may want to try another vendor?s drive diagnostic software for further diagnostics.