Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 171)

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20.5. Erasing unnecessary audio files in a DAISY title.
You can erase any unnecessary audio files from a DAISY title on a CF card
or CD disc. In the case of a CF card, unnecessary audio files are erased
physically. In the case of a CD-R or CD-RW disc, unnecessary audio files are
erased virtually. By using PLEXTALK's "Erase unnecessary audio files"
function, you can prevent these files from being transferred in the backup
process from CD to CF card.
If you have made a recording and have then edited it, cutting one or more
sections in the process, there may be audio files that are no longer
required by your DAISY project. If you wish to erase these unwanted files,
do the following:
• Press the Menu key once to access the Main Menu.
• Use the Number 4 or 6 key to go to the "Media Management"
option and select it by pressing the Enter key.
• Use the Number 4 or 6 key to go to the "Erase unnecessary audio
files" option and select it by pressing the Enter key.
• PLEXTALK will ask you to confirm that you wish to proceed. Press
the Enter key to continue or the Cancel key to abort.
• If you press the Enter key, PLEXTALK will start the erasing process.
Shortly afterwards, the process will be completed and PLEXTALK
will say "Finished".
NOTE: This function only works for DAISY titles. You cannot erase Music
CD audio files.
NOTE: This function will only work for audio files that are no longer
referenced by the remaining DAISY title.
NOTE: If all audio files are still in use, PLEXTALK will say "All audio files are
used in this title".