Microsoft KB Archive/71318

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CHKDSK Fails on RAM Disk with More Than 512 Directory Entries PSS ID Number: Q71318 Article last modified on 07-14-1993 PSS database name: O_MSDOS

4.00 4.01 4.01a

MS-DOS

The information in this article applies to:
- Microsoft MS-DOS operating system versions 4.x

Summary:

A RAM disk created with the RAMDRIVE.SYS device driver can have up to 1024 root directory entries. The MS-DOS versions 4.x CHKDSK command, however, cannot handle a RAM disk with more than 512 root directory entries. When the CHKDSK command is executed on such a RAM disk, it gives the error “Invalid media type” and may cause the machine to stop (hang).

Workarounds

  • Use the RAMDRIVE.SYS device driver only with 512 or fewer root directory entries and subdirectories created for any additional files.

    -or-

  • Do not run the CHKDSK command on the RAM disk.

Microsoft has confirmed this to be a problem with MS-DOS versions 4.00, 4.01, and 4.01a. This problem does not occur in later versions of MS-DOS.

Additional reference words: 4.00 4.01 4.01a noupd

Copyright Microsoft Corporation 1993.