More info. This is on the OS volume, since chkdsk runs immediately when run against Recovery Partition. Chkdsk appears not to run against 209MB System partition, which only appears in Control Panel, Administrative Tools, Computer Management, Disk Management. System partition is labeled as the Active partition and the system partition, while OS partition is labeled as Boot, Pagefile, Crashdump and obviously also appears to contain the running Windows7 operating system, Windows 7 Home Premium.
The disk drive(s) is/are Western Digital 2.5" 7200rpm (Scorpio Black). Running Western Digital's Diag504f.exe program is useless because it does not recognize any Western Digital drives and therefore refuses to perform ANY diagnostics.
This computer has NOT been connected to the internet, therefore, foreign viruses are not very likely. There is discussion of chkdsk problems reported during beta-testing on Neowin.net,
http://www.neowin.net/news/main/09/0...sty-chkdsk-bug