Emulex MD21

Rats, I wanted to use an Emulex MD21 from a Sun external SXSI box to hook my PDP11s Fuji M2246E ESDI drive (that connects to the QBUS via an Emulex QD21) upto a PC to do an image dump. The MD21 works OK with a Sun drive (a Micropolis model 1558) & the PC can verify each block on that, but with the Fuji M2246E hooked up, I get "unexpected SCSI command failure" from the Adaptec AHA1540CF BIOS when trying to verify the disk - host adapter status : 00h - no host adaptor error target status : 02h - check condition sense key : 02h - not ready +sense code : : 22h +sense code qualifier : 00h mean anything to anyone? The Fuji 2246E is working happily in the PDP11/83 so I don't believe the drive is faulty (yet!) I noticed the MS21 announce itself to the SCSI controller as an "Emulex MD21/S2". I wonder if there is specific Sun firmware in it to talk to only Sun approved ESDI drives?...