Roland G-70 - Manual (Page 210)

Disk/Media functions
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G-70 Music Workstation
(In the case of a floppy disk, the “External Memory”
message will read “Floppy Disk”, of course.)
(6) Press the [YES] field to format your disk/card.
Press [NO] or [Back] to return to the FORMAT display
page without formatting.
(7) Wait for the confirmation to appear, then press
the [EXIT] button to return to the main page.
Note: Never remove the floppy disk or memory card while the
operation is in progress. Wait for the confirmation to appear
before returning to business as usual.