A. Win2K, Windows NT Service Pack 6 (SP6), and NT SP5 introduced several new NTFS switches for Chkdsk. The /i switch performs a moderate check of index entries, and the /c switch stops checking cycles within the directory structure. I don't recommend using either switch because they circumvent important file checks. The /x switch, which Win2K introduced, dismounts a drive, then runs Chkdsk /f on the drive. However, the /x switch doesn't work with the boot volume, and you can't lock the volume (although the switch dismounts it).