Vax 11/750 disks

[Pontus]

Hi all.

I have a Vax 11/750 coming my way. It currently has a three RA81 disks
in a half-height rack. I feel that the RA81 takes up a little too much
room. I would rather run on as small disks as possible (physical size of
course). What options do I have? I believe that RA90 would work with
existing controllers and I could fit one or two of those into a rack I
already have.

Kind regards,
Pontus.