Generic _single-density_ floppies are what the RX01/2 needs. So AFAIK any pre-formatted single-density floppy will work in either one. AFAIK, originally, all SSSD floppies came already low-level formatted, but that may have changed later on. (I don't recall if DSSD floppies exist; if they did, the RX0x would probably just ignore the second side.) I'm not sure what you mean by 'blank' - did you mean 'no data/ file system', or 'not low-level formatted'? The thing is that neither RX0x can _low-level format_ floppies (i.e. write sector headers, etc). They _have_ to have pre-formatted floppies. I have this bit set that DEC did it that way with the RX01 since that was the (then minimally-used) IBM standard; if so, probably they just continued that way with the RX02. So you _can_ feed an RX0x xSDD floppies - if you first put them in a machine which will format them to xSSD low-level format. (Which I think someone has previously enquired about here.) Noel