@Scuzz
No Problem .. I was just pointing out that your statements
were inaccurate.
As far as OS 2.1 is concerned, as long as its a true copy
of OS 2.1 it should work. On my A2k I run OS 2.1 with the
2.04 rom. (I don't own a 2.05 rom) I had no problems
whatever installing it.
As for the SCSI drive, well that deponds on the rom version
on the card. On my A2091 card I have ver 6.1 roms and it
will handle up to a 1 gig drive (maybe more but not 2.1
gigs). Some of the earlier A2091 cards had earlier versions
of roms and may not support drives up to 1 gig (I don't
know, I haven't tried it). The A2091 card is supposed to
support drives up to 4 gigs with the version 7.0 roms but
I don't have a set of those roms so I can't verify that.
I'm looking for a set of the 7.0 roms to buy. (hard to find)
As for your 4.3 gig drive you won't get it to work unless
you switch to a different file system. The FastFile system
of OS 2.xx to OS 3.1 will only support upto a 4 gig drive.
So 4.3 gig is too big and it won't format it. However if
you upgrade to OS 3.5 or 3.9 then you should have no
problems with the 4.3 gig drive.(you need 3.1 roms to
upgrade to OS 3.5 or 3.9)
If you really want to use the 4.3 gig drive you could
try switching to 'SmartFile System' on Aminet. I haven't
tried it but many here on A.Org have and say it works
quite well.