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."
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