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Format Function
Compatibility?
Cost of Media?
Erasable?
Capacity?
Storage Life?
Maximum Recording Speed?
Application?
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.
CD-R
Nearly all CD-ROM drives
Audio CD Players
All but the earliest DVD drives
Very Low
No - Write Once
650MB data / 74 min. Audio
700 MB data / 80 min. Audio
75-200 years
16X
Archival Storage
Storage requiring "audit trail" (med-
ical/financial/legal records, etc.)
Audio CD
Distribution of Large
Data Files
Prepare Multimedia
Presentation
5
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)
2X that of CD-R
Yes - May be re-recorded up to
999 times
650MB data
700 MB data / 80 min. Audio
30 years
10X
Back-up
Supplement to hard drive
Software Development
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