Tested more things:

Compaq 9.1Gb SCSI drive via a 68pin to 50pin adapter; this one is seen by Lido and Apple (patched) disc utility,

but can't be formatted. (OSErr = 5 Bad SCSI Command: phase error.)

While using this disk, scsi bus scanning with Lido was veeeery slow (~10sec per scsi device ID)

Lido with the acard adapter and the 8gb Maxtor disk gives no device found at all.

(the acard is a 7720U 50pin)