Booted Knoppix 5.10 - OK Mounted floppy - OK Formatted floppy - OK Wrote 850K text file to floppy - OK Read floppy in PC running Vis...er...another OS - OK Booted server back to CentOS 5.1 - OK mount /dev/fd0 /mnt/floppy ... mount: you must specify the filesystem type less /var/log/messages: Jun 23 14:49:05 data01 kernel: floppy0: sensei repl[0]=80 Jun 23 14:49:05 data01 kernel: floppy0: -- FDC reply errorfloppy0: probe failed... Jun 23 14:49:06 data01 kernel: floppy0: unexpected interrupt Jun 23 14:49:06 data01 kernel: floppy0: sensei repl[0]=80 Jun 23 14:49:06 data01 kernel: floppy0: -- FDC reply errorend_request: I/O error, dev fd0, sector 0 Jun 23 14:49:07 data01 kernel: floppy0: unexpected interrupt Jun 23 14:49:07 data01 kernel: floppy0: sensei repl[0]=80 Jun 23 14:49:09 data01 kernel: floppy0: -- FDC reply errorfloppy0: unexpected interrupt Jun 23 14:49:09 data01 kernel: floppy0: sensei repl[0]=80 [Snip] Jun 23 14:49:22 data01 kernel: hfs: unable to find HFS+ superblock This server is running 2.6.18-53.1.21.el5xen But I am getting the same on a 'straight' server running 2.6.18-53.el5 To be honest I'm not going to pursue this as the need for floppies is very small and the USB one works, but this may be of use to others or someone closer to the OS may want to take a look?