SMD replacement options?

Howdy, In my restoration work on the Sun 1's I'm working with, I'd like to find a "modern" drive replacement (to allow me to boot the box, so I can cut down on the wear and tear on the original drive...it does still work, but like to not use it all the time). I've seen other adapters for various other protocols (i.e. SCSI and IDE) that allow for either SD card or CF cards to be used as drives. I'm wondering if such a beast exists for an SMD drive that would work with the xy controllers I have. I do have one or two SCSI controllers (but not enough for all of my multibus machines) so I have that partial answer. But I have a bunch of xy controllers that are were what were there originally... so I'd like to stay with that if I can... Thanks Earl the Squirrel