APPENDIXB
DOS ERROR MESSAGES
NOTE: Many commercial program diskettes are intentionally created with one or
more
of
the following errors, to keep programs from being improperly duplicated.
If
a disk error occurs while you are making a security copy
of
a commercial
program diskette, check the program's manual. If
its
copyright statement does not
permit purchasers to copy the program for their own use, you may not be able
to
duplicate the diskette. In some such cases, a safety spare copy
of
the program
diskette
is
available from your dealer or directly from the company for a reasonable
fee.
00: OK (not
an
error)
This
is
the message that usually appears when the error channel
is
checked.
It
means there
is
no current error
in
the disk unit.
01: FILES SCRATCHED (not
an
error)
This
is
the message that appears when the error channel
is
checked after using the
SCRATCH command. The track number tells how many files were erased.
NOTE:
If
any other error message numbers less than
20
ever appear, they may be
ignored. All true errors have numbers
of
20
or more.
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 block or a header that has been destroyed. Usually unrecovera-
ble.
21:
READ ERROR (no sync character)
The disk controller
is
unable to detect a sync mark on the desired track. Caused by
misalignment, or a diskette that
is
absent, unformatted or improperly seated. Can
also indicate hardware failure. Unless caused
by
one of the above simple causes,
this error
is
usually unrecoverable.
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. Occurs
in
conjunction with BLOCK commands and indicates
an
illegal track and/or sector request.
23:
READ ERROR (checksum error
in
data block)
There
is
an
error
in
the data. The sector has been read into disk memory, but its
checksum
is
wrong. May indicate grounding problems. This fairly minor error
is
often repairable by reading simply and rewriting the sector with direct access
commands.
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