NTI’s FileCD can’t “packet write in ISO 9660”, which is impossible. UDF packet writing and ISO 9660 writing are two different specifications. FileCD can write in ISO 9660 to a CD-RW disk, but this choice does not use packet writing. Any other premastering program such as Nero, EZCD Creator, WinOnCD, Prassi, etc. can do the same thing. I don’t understand why FileCD presents this as something unusual, except that most packet writing programs only do packet writing and not ISO 9660 as well. It is not really much of a feature in my opinion since all premastering programs do the same thing.
One of the main features of most packet writing programs is drive letter access, enabling drag & drop to a CD-RW with Windows Explorer (using the disk as a hard drive). FileCD won’t do this directly. See Why do I get an error when I try to drag and drop a file to my CDRW drive?
DirectCD may be the only major packet writing program that uses CDR as well as CD-RW disks. When CDR disks are used, the disk is written in variable length packets, which doesn’t require the extensive formatting for CD-RW fixed length packets. The formatting takes a few seconds and uses less overhead than CD-RW, providing almost 100 MB more writable space (624 MB after formatting) on a 650 MB disk. In addition, DirectCD offers the option to close a packet written CDR to ISO 9660. This requires leaving at least 10 MB of space to write ISO information that will allow the disk to be read on any computer. This ISO information is written “on top” of the underlying UDF structure, and provides a reference that enables computers to read the information as if it were written in ISO 9660.
In general, DirectCD offers advanced features that may not be found on other packet writing programs. Some of these features are:
a. The ability to compress files while packet writing, enabling significantly more storage capacity per disk.
b. A writing techique called “sparing” is used that keeps a CD-RW disk from wearing out prematurely due to writing over the same sector again and again.
c. Bad sectors can be internally marked as unusable.