Yamaha CRW2100FXZ, CRW2100SXZ 1.2.3. About Partial CAV Writing Method

Format Function	CD-R	CD-RW
Compatibility?	Nearly all CD-ROM drives	CD-RW drives
	Audio CD Players	MultiRead(MR) enabled CD-ROM
	All but the earliest DVD drives	drives and CD-Players (MR dri-
		ves/players are a recent develop-
		ment with a limited installed base)
Cost of Media?	Very Low	2X that of CD-R
Erasable?	No - Write Once	Yes - May be re-recorded up to
		999 times
Capacity?	650MB data / 74 min. Audio	650MB data
	700 MB data / 80 min. Audio	700 MB data / 80 min. Audio
Storage Life?	75-200 years	30 years
Maximum Recording Speed?	16X	10X
Application?	Archival Storage	Back-up
	Storage requiring “audit trail” (med-	Supplement to hard drive
	ical/financial/legal records, etc.)
	Audio CD	Software Development
	Distribution of Large
	Data Files
	Prepare Multimedia
	Presentation

1.2.3. About Partial CAV Writing Method

Writing to a CD-R disc is normally done using CLV (Constant Linear Velocity) method the disc’s rotation speed is adjusted continuously to keep a steady data transfer rate. The data transfer rate in the CLV is held constant but, because of the smaller size of the inner circles of the disc versus the large outer circles, the disc speed is adjusted depending upon which portion of the disc data is being recorded on (i.e. if recording on the inner edge versus the outer edge, the disc should rotate faster to keep up with the data transfer rate - which is held steady throughout the writing cycle.

In contrast, the CAV (Constant Angle Velocity) method keeps the disc’s rotation speed constant while adjusting the data transfer rate depending upon which portion of the disc is being recorded. In other words, in the CAV writing method, the outer portion of the disc should receive an increased data transfer rate compared to the inner portion. Applying the CAV method enables a significant increase in the data transfer rates with a minimum load increase to the drive’s mechanism.

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