First use sync command update the super block. Then use the eject utility. It is used for those removable media devices that do not have a manual eject button, or for those that do, but are managed by Volume Management.
1) Type command sync to write superblock or data to device (for floppy disk):
# sync;sync
2) Use eject command to eject (or unmount it) floppy:
# eject fd
3) To Remove / unmount the CDROM disk
Use eject command as follows:
# eject cd
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