LiteOn's LTR-40125S

Z-CLV v's P-CAV
What is Zone CLV ?
It is the recording method which records data with a certain constant speed (Constant Linear Velocity) for each zone which is partitioned from inner area to outer area in a disc.

CD(-R/RW) employs a Constant Liner Velocity (= Constant recording density) recording method (CLV) in order to store much more data and music information into a disc. A rotation speed of a disc will be approximately 500 rpm at a standard recording speed and approximately 8000 rpm at 16X recording speed. One of the concerns of high-speed recording by CLV technology was that it would lead to high material cost in order to prevent vibration of mechanism and to produce an extremely high quality disc. On the one hand, over 16X high-speed recording technology has been realized by constantly advancing development of high-speed semiconductors and more high power laser.

The LiteOn LTR-40125S supports writing speed with the use of the Z-CLV writing technology. The writing speeds are divided into 4 zones. The drive starts writing at 20x from lead-in till the 4mins, shifts up to 24x at 8mins, shifts up to 32x at 18mins and lastly shifts to 40x at 53mins and stays there until the end.

What is P-CAV ?
Partial CAV Writing -- P-CAV is a method used to burn a disc without the burn process being interrupted at any stage of the burn.

In contrast, CAV (Constant Angular Velocity) method uses a constant disc rotation speed at any portion of the disc whereas the data transfer rate will vary. Because CAV method has an advantage to largely increase the data transfer rate with a minimum load to the drive's mechanism (compared to CLV's rotation speed adjustment), many of current CD-ROM drives use CAV method. CD formats define the constant linear density of written data (data should be written onto the disc track in the constant pitch) so that amount of recorded data per disc rotation will increase as the writing point moves from the inner to the outer. In other words, in CAV writing the outer portion has an increased data transfer rate.

P-CAV method keeps disc rotation constant in the inner portion of the disc as writing speed smoothly accelerates outwards until it reaches top speed. After that, writing speed is kept constant (CLV) until the end of the writing. 
Due to this, maximum speed can be reached through smooth acceleration without any links. Ideal for Audio CDs and premastering a disc for mass duplication.
On the other hand, in case of Z-CLV, maximum speed cannot be reached without making links. Unacceptable for users who demand the highest achievable quality.

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