I've never tried another brand PCMCIA floppy with my Libretto. If you don't have a floppy drive, you can put the hard drive you want to use in the Libretto into a machine with a floppy drive in it. From there, you can copy your OS installation files to the drive and use the SYS command to make it bootable. Once you put the drive in the Libretto, it should boot to the command line and run your OS installation directly from the drive. That's how I loaded Windows 95 onto my Libretto before I got a floppy drive.