Teac GF-550 Owner's Manual page 30

As has been explained earlier, in order for a disc to become a
standard CD, it must have a Table of Contents (TOC) written to it.
This process is known as finalizing.
Once finalized, CD-R discs are truly final. No more tracks can be
recorded on them. By contrast, CD-RW discs can be "unfinalized",
and if there is space, further material can be recorded on them.
< You cannot finalize the blank disc.
< When the disc has reached its maximum recordable time, it will
automatically finalize even when recording is still in progress. A
finalized disc cannot be further finalized.
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"FINAL" appears on the display.
< To cancel the finalizing process, press the STOP button (H).
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"NO TOC" and "REC" indicators blink, and the remaining time for
the finalizing operation appears in the display.
When the operation has been finished, the NO TOC indicator
turns off and the display returns to the track/time display.
During finalizing, no button works.
< Although finalized CD-R discs may be played on ordinary CD
players, remember that finalized CD-RW discs may not play on
ordinary CD players.
< The time for the finalizing vary with the type of the disc.