doctorq,
It is refreshing to read your concise reply. Most drives install with the "original" install disk (ie this case GVP install disk).
The loss of drive showing up is usually a tooltype issue, as you said. There is a program called SCSI Inquire that reflects this issue quite candidly. Here's a list of some device handlers that go in the devs.
Commodore A2091/590/3000 scsi.device
2nd Commodore A2091 "2nd.scsi.device"
Commodore 1200/4000 scsi.device
Commodore 4091/DKB "2nd.scsi.device"
GURU ROM omniscsi.device
GVP 4008/Impact SeriesII A500/2000 gvpscsi.device
GVP 3001 680x0 Combo SCSI gvpscsi.device
GVP 3001 68030 Combo IDE gvpat.device
IVS Trumpcard Classic IVS_SCSI.device
IVS Trumpcard Professional IVS_SCSIpro.device
Expansion Systems DataFlyer ExpSys.device
Expansion Systems SCSI+ or XDS Chassis ExpXDS.device
AS&S FastLane Z3 z3scsi.device
Warp Engine warpdrive.device
NewTek Flyer flyerscsi.device
ICD Advantage 2000 icddisk.device
ICD AdSCSI icdscsi.device
ICD AdIDE adide.device
ICD AdIDE2 icdide.device
DKB RapidFire dkbscsi.device
AlfaData/bcs Oktagon SCSI oktagon.device
Comspec SCSI CompspecSCSI.device
Supra Series II/III suprascsi.device
MicroBotics Hardframe HardFrame.device
Note: Capitals and quotes are important, as device handlers are case sensitive.