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Microsoft KB Archive/105062

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Knowledge Base

MS-DOS Err Msg with DiscTec: Unrecoverable Disk Error

Article ID: 105062

Article Last Modified on 5/6/2003


  • Microsoft MS-DOS 5.0 Standard Edition
  • Microsoft MS-DOS 5.0a
  • 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 Q105062


You may receive the following error message when you try to install MS-DOS:

Unrecoverable Disk Error
Hard Disk is not readable.


This problem occurs when the DiskStor DISCTEC.SYS removable device driver is loaded in memory.


To work around this problem:

  1. Edit your CONFIG.SYS file to remark out (REM) the command for DISCTEC.SYS.
  2. Restart your computer.
  3. Install MS-DOS.
  4. Edit your CONFIG.SYS file and add the DISCTEC.SYS command.
  5. Restart your computer.

Additional query words: 6.22 6.20 stepup Upgrade Step-Up

Keywords: KB105062