Defrag Reports Unmovable Block Without Any Hidden/System Files (100013)

The information in this article applies to:
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.21
    Microsoft MS-DOS operating system 6.22

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."

Modification Type: Major Last Reviewed: 12/3/1999
Keywords: KB100013