Abnormal FORMAT Termination Yields Invalid Media (84941)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• Microsoft MS-DOS operating system 6.0
This article was previously published under Q84941
If you use the MS-DOS FORMAT command to reformat a fixed disk drive and you
terminate the command by pressing CTRL+C (or CTRL+BREAK) at the "Proceed
with Format (Y/N)?" prompt, later attempts to access the drive produce the
following error, even if the drive was properly formatted before the
Invalid media type reading drive X
Abort, Retry, Fail?
To regain access to the drive, do the following:
• Issue the FORMAT command again, and press N (for No) at the
"Proceed with format (Y/N)?" prompt.
• Reboot the machine.
Microsoft has confirmed this to be a problem in MS-DOS versions 5.0, 5.0a,
and 6.0. This problem was corrected in later versions of MS-DOS.
This condition is caused by an error in the MS-DOS FORMAT CTRL+C
handler. When FORMAT is terminated at any point by pressing CTRL+C (or
CTRL+BREAK), it assumes that the disk is only partially formatted and
therefore unusable; therefore, the disk is marked as such.
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