Commodore 1581 - Page 123

22: READ ERROR (data block not found)
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 (CRC error in data block)
There is an error in the data. The sector has been read into disk
memory, but its CRC is wrong.
24: READ ERROR (bad sector header)
The data or header has been read into disk memory, but a
hardware error has been created by an invalid bit pattern in the
data byte.
25: WRITE ERROR (write-verify error)
The controller has detected a mismatch between the data written
to diskette and the same data in disk memory. May mean the
diskette is faulty. If so, try another. Use only high-quality diskettes
from reputable makers.
26: WRITE PROTECT ON
The controller has been requested to write a data block while the
write-protect sensor is uncovered. Usually caused by writing to a
diskette whose write protect notch is pushed back to expose the
hole to prevent changing the diskette's contents.
27: READ ERROR (CRC error in header)
The controller detected an error in the header bytes of the
requested data block. The block was not read into disk memory.
30: SYNTAX ERROR (general syntax)
The DOS cannot interpret the command sent to the command
channel. Typically, this is caused by an illegal number of file
names or an illegal pattern. Check your typing and try again.
31: SYNTAX ERROR (invalid command)
The DOS does not recognize the command. It must begin with
the first-character sent. Check your typing and try again.
32: SYNTAX ERROR (long line)
The command sent is longer than 58 characters. Use abbreviated
disk commands.
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