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Microsoft KB Archive/103816

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Knowledge Base

Err Msg Swapping Disk on Floptical Drive: Invalid Disk...

Article ID: 103816

Article Last Modified on 11/17/2003


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

This article was previously published under Q103816


If you change media on a Bernoulli SCSI floptical drive, you may receive the following error message:

Invalid disk change reading <letter>
Please insert volume <XXXXXXXX> serial 0070-06f4
Abort, Retry, Fail?

where <XXXXXXX> contains random characters (if the disk has no label) or the label of the previous disk that was read.

This problem can occur on floptical drives that support several different media (such as drives that support 21 MB, 1.44 MB, and 720K). If you alternate between uncompressed and compressed and 1.44-MB and 21-MB disks, you may receive the error message noted above.


This situation occurs because of a problem in the floptical device driver. The driver does not detect media changes when the disk does not have a volume serial number.


To work around this problem, ensure each disk has a volume serial number.

All disks formatted with MS-DOS version 4.0 or later have a serial number; however, many pre-formatted disks do not.

Additional query words: 6.22 6.20 floppy

Keywords: KB103816