Philips DVDRW22899 - Manual (Page 14)

2.5 How to use your CD-RW or DVD+RW drive as a disk drive
Install 'Packet Writing' software on your computer to be able to access CD-R/RW discs directly in your
CD-ReWriter or DVD+RW drive, just like any other disk drive to which data can be written.
This software will load automatically each time you start Windows. It runs in the background, so that
you may read and write from and to the CD-R/RW disc in the drive from within Windows Explorer or
any other Windows application (word processor, spreadsheet, etc.).
The CD-R/RW disc used for this purpose stays 'open' and can only be read on computers that have
'Packet Writing' software or a UDF Reader installed. Alternatively, the 'Packet Writing' software can be
used to close the current session, thereby making the disc readable for regular 'MultiRead' drives.
After this, data can still be added to the disc by opening a new session.
NOTE: On CD-R discs, files cannot actually be erased or overwritten, but they can be made invisible
and written again when updating files.