I’ve never heard of a SCSI floppy drive.
Well, at work we have a server (A dell, not sure about the model) and it only has a SCSI interface; Harddisk, Floppy, CD-ROM and a tapestreamer... It's quite old and is only used to support some user directories (store files)
Must admit I never seen a SCSI tapedrive tho ;-), I guess you have better luck finding drivers for MS-DOS 4 or something like that.... Some kind of backup drive maybe..