Why is a Master recorded using Packet format NOT suitable as a master ?
The packet CD format is used with CD-RW media. CD masters recorded in packet format are not acceptable. If you are creating a master for duplication on a CD-RW drive ensure that a recognised CD format is selected in the settings. Acceptable formats include ISO 9660, CD-XA, Mac HFS & Hybrid Mac / PC. See CD ROM > Mastering Hints and Tips page for more details.