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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 message 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 that there is an error in one or more of the
data bytes. The data has been read into the DOS memory, but the check
sum over the data is in error. This message may also indicate grounding
problems.
24:
READ ERROR (byte decoding error)
The data or header has been read into the DOS memory, but a hardware
error has been created due to an invalid bit pattern in the data byte. This
message may also indicate grounding problems.
25:
WRITE ERROR (write-verify error)
This message is generated if the controller detects a mismatch between the
written data and the data in the DOS memory.
26:
WRITE PROTECT ON
This message is generated when the controller has been requested to write
a data block while the write protect switch is depressed. Typically, this is
caused by using a diskette with a write protect tab over the notch.
27:
READ ERROR (checksum error in header)
The controller has detected an error in the header of the requested data
block. The block has not been read into the DOS memory. This message
may also indicate grounding problems.
28:
WRITE ERROR (long data block)
The controller attempts to detect the sync mark of the next header after
writing a data block. If the sync mark does not appear within a pre-deter-
mined time, the error message is generated. The error is caused by a bad
diskette format (the data extends into the next block), or by hardware
failure.
29:
DISK ID MISMATCH
This message is generated when the controller has been requested to ac
cess a diskette which has not been initialized. The message can also occur
if a diskette has a bad header.
30:
SYNTAX ERROR (general syntax)
The DOS cannot interpret the command sent to the command channel.
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