BAD MSG:
not just 0x01 or 0x02 or 0xf0, etc).  About 3572 bytes worth.
Wanting to confirm the location, I ran it again...this time 95573 bytes.

To check disk contents I adapted the program I used to read back to seek
to the above position.  No problem.  A run after that again, 85212 and
33157.

Try again with 2.2.8-STABLE (built from GENERIC):

# dd if=/dev/zero bs=16384k of=/dev/rsd0s4
dd: /dev/rsd0s4: short write on character device
dd: /dev/rsd0s4: end of device
125+0 records in
124+1 records out
2089221120 bytes transferred in 244.473397 secs (8545801 bytes/sec)

No non-zero bytes were read back using the program I wrote.

And with: # dd if=/dev/rsd0s4 bs=16384k | hexdump -x -n 2089221120
0000000    0000    0000    0000    0000    0000    0000    0000    0000
*
124+1 records in
124+1 records out
2089221120 bytes transferred in 433.489148 secs (4819547 bytes/sec)
7c86fc00
(repeated twice)

At no time during this was the hardware changed (though it's in a
somewhat state of advaced disarray).

Darren


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