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Max Block Size in mt

I'm trying to read data from a Sony AIT-e260 SCSI drive under Cygwin.
Cygwin 1.5.21-2
mt 2.3.1

I know that the tape is good, because I can read from it (using the same
drive) under Redhat.

The first file on the tape is 96 bytes so I do the following:
>> export TAPE=/dev/nst0
>> mt setblk 0
>> dd if=$TAPE of=header.txt

This works fine.

The second file on the tape is 1GB and is written with a block size on
When I do the following:
>> mt setblk 204800
>> dd if=$TAPE of=segment.0

I get the following error:
mt: /dev/nst0: Invalid argument

I've found that the maximum block size in mt can only be 64kB.

Am I missing something or is there a limitation to mt under Cygwin?

If I leave the block size set to variable, I get the following:
>> mt setblk 0
>> dd if=$TAPE bs=204800 of=segment.0
dd: reading `/dev/nst0': Cannot allocate memory
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.078 seconds, 0.0 kB/s

Just for kicks, the tape drive status before any dd is:
drive type = 8mm Sony AIT1 tape
drive status = 838860800
sense key error = 0
residue count = 0
file number = 1
block number = 0
Tape block size 0 bytes. Density code 32 (ALRF-2 (SLR 7)).
General status bits on (87030000):

Jeffry T Ross
The MITRE Corporation

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