I am running NetBSD 1.3.2 with a Adaptec model AHA-1542CF SCSI
controller with a Python 28388-XXX, 4.61 SCSI2 1/sequential drive.  I
keep receiving the following error when doing a large data transfer
(tar, dump, ect...):

st0(aha0:1:0): timed out
st0(aha0:1:0): timed out AGAIN

Does anyone know of any way to clear this error (other than rebooting)
or what may be causing this error?

Any suggestions are welcomed.

Thanks
Chris