Sony AIT-1 tape backup

Hi,

I have a Sony AIT-1 tape backup unit (IDE) installed in a PowerMac
running debian/testing with a 2.6.8 kernel.
I have not had much success getting it to work :(

I have made a symlink from /dev/tape to /dev/nst0

I have the following in my /etc/modules.
    ide-tape
    ide-scsi
    ide-cd
    ide-detect
    st
    scsi_mod

I only time the machine recognises the IDE tape drive is if I reboot
with ide-tape uncommented in the modules file.  I can shows up as
/proc/ide/hde/ -> /proc/ide/ide2/hde/

    # cat /proc/ide/hde/model
    SONY SDX-420C

    # cat /proc/ide/hde/driver
    ide-scsi version 0.92


When I initially boot I can run commands like "mt status", etc.
When I try writing to the tape it just seems to hang and then I cannot 
talk to the device again.
I get error messages such as:
    /dev/tape does not exist
    /dev/tape no such device or address

More info.
    # mt erase

    # mt seek
    /dev/tape: Input/output error

    # mt status
    SCSI 2 tape drive:
    File number=-1, block number=-1, partition=0.
    Tape block size 512 bytes.  Density code 0x30 (AIT-1 or MLR3).
    Soft error count since last status=0
    General status bits on (1010000):
       ONLINE IM_REP_EN

Any ideas what could be causing this?
Has anyone successfully used a Sony AIT-1 IDE on a Linux machine
(PowerPC or otherwise).

Many thanks in advance for any help.
Regards,
Brendan Simon.

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