DBLSPACE /CHKDSK The MS-DOS 6.0 version of DoubleSpace included the DoubleSpace Chkdsk command (DBLSPACE /CHKDSK) for checking the validity of the specified compressed drive. DoubleSpace no longer provides a Chkdsk command. To check and repair compressed drives, use the new ScanDisk program, a full-featured disk analysis and repair utility. ScanDisk can check and repair both compressed and uncompressed drives. It can even check and repair unmounted compressed volume files. For more information, see .