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122 Everything You Ever Wanted to Know About DVD<br />
Connectivity of DVD drives is similar to that of CD drives: EIDE (ATAPI),<br />
SCSI-2, USB, etc. All DVD drives have analog audio connections for playing<br />
audio CDs. No DVD drives have been announced with their own DVD<br />
audio or video outputs (which would require internal audio/video decoding<br />
hardware).<br />
Almost all DVD-Video and DVD-ROM discs use the UDF bridge format,<br />
which is a combination of the DVD MicroUDF (subset of UDF 1.02) and ISO<br />
9660 file systems. The OSTA UDF file system will eventually replace the ISO<br />
9660 system originally designed for CD-ROMs, but the bridge format provides<br />
backwards compatibility until more operating systems support UDF.<br />
What Is the Audio Output Connector on a DVD Drive For?<br />
DVD-ROM drives and DVD recordable drives have an RCA connector or a<br />
4-pin flat (Molex) connector to send analog audio to the audio card in the<br />
PC. This is just like the connecter on a CD drive, and in fact it’s only for playing<br />
audio CDs. The audio from DVDs comes through the computer, not out<br />
of the drive. Playing audio from a CD used to require the analog audio output,<br />
but most PCs can now play digital audio directly from the CD so the<br />
analog connector is not needed.<br />
What About Recordable DVD: DVD-R, DVD-RAM,<br />
DVD-RW, DVD�RW, and DVD�R?<br />
There are six recordable versions of DVD-ROM: DVD-R for General, DVD-R<br />
for Authoring, DVD-RAM, DVD-RW, DVD�RW, and DVD�R. DVD-R and<br />
DVD�R can record data once, similar to CD-R, while DVD-RAM, DVD-RW,<br />
and DVD�RW can be rewritten thousands of times, similar to CD-RW.<br />
DVD-R was first available in fall 1997. DVD-RAM followed in summer 1998.<br />
DVD-RW came out in Japan in December 1999, but was not available in the<br />
U.S. until spring 2001. DVD�RW became available in fall 2001. DVD�R<br />
was released in mid-2002.<br />
Recordable DVD was first available for use on computers only. Home<br />
DVD video recorders (see “Can DVD record from VCR/TV/and so on?” in<br />
<strong>Chapter</strong> 1, “General DVD”) appeared worldwide in 2000. This book uses the<br />
terms “drive” and “video recorder” to distinguish between recordable computer<br />
drives and home set-top recorders.<br />
DVD-RAM is more of a removable storage device for computers than a<br />
video recording format, although it has become widely used in DVD video<br />
recorders because of the flexibility it provides in editing a recording. The<br />
other two recordable format families (DVD-R/RW and DVD�R/RW) are<br />
essentially in competition with each other. The market will determine which
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