Teac GF-550 Owner's Manual page 31

Erase procedures are possible only on an unfinalized CD-RW disc.
If a CD-RW disc has been finalized, unfinalize it prior to erasure.
Note that it is not possible to perform any erase or unfinalize
procedures on a CD-R disc.
It is possible to erase the last recorded track. It is also possible to
erase a whole disc.
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Each time the FINALIZE/ERASE button is pressed, the display
changes as follows:
"UnFINAL" (unfinalize) appears when a finalized disc is loaded.
"FINAL" appears when the disc has not been finalized. If you
press the FINALIZE/ERASE button again, "ErASE" and the last track
number will appear.
Select this to unfinalize the disc.
Select this to erase the last track on the disc.
< This will not appear when only one track is recorded on the disc.
Select this to erase all the tracks.
< To erase a number in a finalized CD-RW, unfinalize (UnFINAL) first
and then erase the number by the same procedure (ErASE or
ErASE ALL).
< To cancel the erasing or unfinalizing process, press the STOP
button (H).
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The remaining time for the operation appears in the display.
When the operation has been finished, the display returns to the
track/time display.
During erasing/unfinalizing, no buttons will work.
< This operation cannot be undone. If you are going to erase a track
or tracks, make sure that they are recordings that you really want
to erase.
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