der Mouse wrote:
   Speaking of
which...does it make sense to start preserving (hoarding)
 older, low-capacity hard drives, be they IDE or SCSI, for smaller
 machines?  They seem to be drying up fast. 
 It does to me - and I have been.  For some time now. :-) 
 
Same here, although I tend to concentrate on ST506/412 drives because there's
no (economical) way to emulate them with something else. Small-capacity IDE
and SCSI units are still easy enough to find [1] in my experience, and
worst-case both interfaces are documented well enough that a unit could be
emulated.
[1] Apart from SCSI drives that support 256 byte sectors, or IDE drives that
work natively with 8-bit transfers.