hello alberron :-)
the problem is simple : AmigaOS3.9 comes with a fastfilesystem that's require the v43 scsi.device to function properly on ide (A4000) or scsi controllers (as in the A3000).
It is not compatible with the ancient AmigaOS2.1 scsi.device, as this one would be unable to cope with nsd or 64bits device commands.
you can try to install the nsdpatch on your old configs (no need on the A4000 as it is incorporated in the setpatch command) but you will need to install the scsi.device v43 patch too (not recommended as the v43 strip is an early beta of the one supplied with OS3.9).
or you can format your syquests cartridges in OFS (slower, but compatible).
is this help?
