APPENDIX B
DOS ERROR MESSAGES
The following error messages are returned through the DS and
DS$ variables. The DS variable contains just the error number
and the DS$ variable contains the error number, the error
message and any corresponding track and sector number.
NOTE: Error message numbers less than 20 should be ignored
with the exception of 01, which gives information about the
number of files scratched with the SCRATCH command.
ERROR ERROR MESSAGE AND
NUMBER DESCRIPTION
20: READ ERROR (block header not found)
The disk controller is unable to locate the
header of the requested data block. Caused
by an illegal sector number, or the header
has been destroyed.
21: READ ERROR (no sync character)
The disk controller is unable to detect a sync
mark on the desired track. Caused by
misalignment of the read/write head, no diskette
is present, or unformatted or improperly seated
diskette. Can also indicate a hardware failure.
22: READ ERROR (data block not present)
The disk controller has been requested to read
or verify a data block that was not properly
written. This error occurs in conjunction
with the BLOCK commands and indicates an illegal
track and/or sector request.
23: READ ERROR (checksum error in data block)
This error message indicates there is an
error in one or more of the data bytes. The
data has been read into the DOS memory, but
the checksum over the data is in error. This
message may also indicate hardware grounding
problems.
B-1
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