I have used 14" (RA-81-sized) disks like the
Fujitsu Eagle
Well, technically the Eagle is a 10.5" disk. Other Fujitsus, like
the 2284, are really 14" (and they have a nice transparent cover
over the HDA so you can see the disks spin and the heads seek...)
and have seen 5.25"
disks, but never used them.
Most 5.25" SMD drives are rather modern and have data rates too high for
the older Emulex (and other brand) SMD controllers. Newer Emulex
SMD controllers, like the QD33 and QD34, don't have a problem with
the high-data-rate SMD drives.
Tim.