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Format Function
Compatibility?
CD-R
Nearly all CD-ROM drives
Audio CD Players
All but the earliest DVD drives
CD-RW
CD-RW drives
MultiRead(MR) enabled CD-ROM
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
700 MB data / 80 min. Audio
650MB data
700 MB data / 80 min. Audio
Storage Life?
75-200 years
30 years
Maximum Recording Speed?
16X
10X
Application?
Archival Storage
Storage requiring “audit trail” (med-
ical/financial/legal records, etc.)
Audio CD
Distribution of Large
Data Files
Prepare Multimedia
Presentation
Back-up
Supplement to hard drive
Software Development
5
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.