Nice to know Sony diagnostics will repair a HD problem. But be sure to keep backed up, monitor the HD SMART data with CrystalDiskInfo - Software, run periodic Disk Check.

I would even re-run the Sony diagnostics a few more times until it shows no repeat problems.

Hopefully you followed the steps I gave you to get a perfect Win7 install. If so you know by now about Puran Defragger which boot-time scan gets even System Files and allows a Disk Check to be scheduled with defrag at boot.