DEC RQZX1 and KDJ11-E boot problem?

I "imaged" (via SIMH/Linux [*]) a Quantum SCSI drive with RSTS/E and connected to the RQZX1 and via the built-in configuration menu able to see the drive (drive label appears at the correct SCSI ID) and run the "read" diagnostics successfully. But using the KDJ11-E boot menu I get an error "10 - Drive not ready" - is there something I need to do in the KDJ11-E or the RQZX1 that I have overlooked? Any ideas would be appreciated. I now have access to the KDJ11-E manual thanks to Bitsavers. But no documentation on the RQZX1, other than what I can glean from the built-in menus. [*] SYSGEN'd and then "dd" the resulting file to the drive. If I "od -o" the drive I can see location 0 and 2 have the DEC boot signature. RQZX1 SCSI Host Adapter Monitor Software Rev 2.2 23-Jun-1993 (C) Digital Equipment Corporation 1992 Hardware Rev L ***************************** Q-bus Configuration ****************************** * * * DMA : Burst length : 01 CSR0 : 172150 MSCP * * Block length : 08 CSR1 : 174500 TMSCP * * Burst delay : 01 * 1.6 us * * * * LUN CSR Mode Drive no. Start LBN End LBN Device Type * * ---------------------------------------------------------------------------- * * DU 0 0 MSCP SCSI ID 0 0000000000 0004124732 Disk * * * * * * * * * * * * * * * * Type Control-Z or <CR> to return to previous menu * * * ********************************************************************************