Chkdsk ("check disk") is one of the tools that can confuse users new to XP Way back when, the DOS disk-checking tool was called Chkdsk. Win9x came with a better disk-checking tool that was called Scandisk to differentiate it from the old DOS tool: Win9X even warned *against* using Chkdsk. But Win2K and XP still call their disk tool Chkdsk. Win9x users who move to XP and then look for Scandisk won't find it; and they may even shy away from Chkdsk, thinking it's the old, discredited DOS tool. But in 2K and XP, Chkdsk is indeed the fully-current disk tool that you'd use where you'd normally use Scandisk in Win9X. This tool is covered in the help files--- and is just another one of the myriad speedbumps we all have to navigate when switching OS versions!
Copied from Fred Langa at click here.
Hope it helps