DVD speed wird net ausgenutzt

[The_Lord_of_Midnight]

http://www.asus.com.tw/products/dvdr...e608/spec.html
Data Transfer Rate
DVD Transfer Rate 8X max CAV 4530 ~ 10800k bytes/s max
CD Transfer Rate 40X max CAV 2750 ~ 6000k bytes/s max.

http://www.asus.com.tw/products/cdrom/s500/qa.html
What are CLV and CAV?
bzw.
http://www.asus.com.tw/products/cdrom/S340/qa.html#diff
Question:
What are CLV and CAV?
Answer:
For CLV, CD-ROM drive has a constant data transfer rate despite of accessing from inner or outer track. To make CD-ROM drive to achieve higher data transfer rate, the most common way is just simply increasing spindle motor speed. For achieving constant data transfer rate, spindle motor need to run faster at inner track and slower at outer track. But, it's very difficult to achieve constant data transfer rate while developing 12X or higher speed drive. Problems such as vibration, noise, disk data accessibility, reliability issue...etc. will come into play during the execution phase of the design, so the data transfer rate will be limited.
For CAV, spindle motor keep running at the same velocity while CD-ROM is accessing data at inner or outer track. In this way, CD-ROM will achieve lower data transfer at inner track and higher transfer rate at outer track. As the statement on CLV, it is more and more difficult to overcome technical issue while CD-ROM's transfer rate is getting higher and higher. For example, spindle motor needs to running at 8000rpm at inner track for 16X performance with CLV mode, and it's really too high for current technology. So we believe CAV will be more suitable for the future higher speed CD-ROM design rather than CLV.