Microsoft KB Archive/100013

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Defrag Reports Unmovable Block Without Any Hidden/System Files

Article ID: 100013

Article Last Modified on 12/3/1999


  • Microsoft MS-DOS 6.0 Standard Edition
  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.21 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q100013


If Microsoft Defragmenter (Defrag) displays unmovable blocks (denoted by an "X") and you don't have any hidden system files on your disk, you probably have one of the following:

  • Lost allocation units. To correct this problem, run CHKDSK /F before you run Defrag. Or, if you have MS-DOS 6.20 or higher, run Scandisk before you run Defrag.
  • Executable files (.EXE or .COM files) that do not have the MS-DOS signatures for .EXE or .COM files ("MZ" or "SC"). Old executable files, shareware files, and some executable files used in copy- protection schemes do not have the MZ or SC signatures.

NOTE: Defrag looks for *DOS.* and *IO.* to find all the system files on your disk. Defrag does not move system files and represents them in the user interface with an "X."

Additional query words: 6.22 6.00 6.20 hard disk drive

Keywords: KB100013