FDRIVE.SYS

It is the DOS driver for Portfolio and FolioDrive floppy
disk unit 1.44 MB.
Install by adding into your c:\config.sys:

device=c:\system\fdrive.sys
(or any other path to the fdrive.sys file)

FDFORMAT.COM

It is a 720KB or 1.44MB diskette formatter for FolioDrive
unit. Run from your DOS prompt on Portfolio.

More info about the FolioDrive from:

sedlakj@dec59.ruk.cuni.cz
or phone: + 42 2 99 61 894