Yamaha W5 Owner's Manual page 42

DISK
Disk Mode lets you save your original voices, song multis and sequence data in
various combinations into disk files on a floppy disk (3.5 2DD type), as well as
load the files back into Internal/Song voice and song memory. It also lets you
perform various disk file management functions like renaming and deleting files
and formatting a disk for the W5/W7 operating system.
And it permits the saving of songs in Standard MIDI File Format-0, as well as the
loading of sequences recorded on other devices and saved in the Standard MIDI
File Format-0 and -1, and the Yamaha ESEQ format.
Within the respective file management operations, the File Directory provides a
convenient display of data lists.
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