Defrag Err: Memory Test Failed at Segment <Address> (101561)

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 Q101561


When you run Microsoft Defragmenter (Defrag), you may receive the following error message:

Memory test failed at segment <address>
where the valid address range is 0000H-A000H.


This error message may occur if you have defective memory.


To correct this situation, have your memory tested and replaced.


Defrag performs a conventional memory test prior to defragmenting a drive by allocating all available conventional memory. The memory test consists of writing all (1) bits to memory and then all (0) bits. It verifies the write succeeded by reading back the value and doing a comparison. If the comparison fails, Defrag reports the failed segment number.

Modification Type: Major Last Reviewed: 11/19/1999
Keywords: KB101561