Search results
Results from the WOW.Com Content Network
Modern compact discs support a writing speed of 52× and higher, with some modern DVDs supporting speeds of up to 24×. [4] Writing a DVD at 1× (1 385 000 bytes per second) [5] is approximately 9 times faster than writing a CD at 1× (153 600 bytes per second). [6]
The rotation speed of DVD at ×1 CAV (~580 rpm) is around three times as high as CD at ×1 (~200 rpm) Disc write time in table does not include overhead, leadout, etc. The following table describes the maximal speed of DVD-R and the relative typical write time for a full disc according to the reviews from cdrinfo.com and cdfreaks.com.
The Zone-CLV recording strategy is easily visible after burning a DVD-R. Zoned constant linear velocity (ZCLV or Z-CLV) is a modification of CLV for high speed CD and DVD recorders where a constant linear velocity is maintained until the next zone, when the speed is stepped up. Early model recorders were CLV drives.
Recording speed is generally denoted in values of X (similar to CD-ROM usage), where 1X in DVD usage is equal to 1.321 MB/s, roughly equivalent to a 9X CD-ROM. In practice, this is largely confined to computer-based DVD recorders, since standalone units generally record in real time , that is, 1X speed.
The different methods put Blu-ray at a staggering advantage in the future, but currently 1x and 2x Blu-ray drives trudge along compared to a 12x DVD drive, which gathers information at a rate of 8 ...
Optical device speeds are often quoted as a multiple of a "basic speed" for that type of device. Thus for CD, the basic speed is 150 kB/s, so a CD-recordable device may be quoted as "4x" or "6x" to indicate a speed of 600 kB/s and 900 kB/s respectively. Typical values are: CD
DVD-RAM version 2.0 (1999), recording speed 2x – Defines discs with more common capacity of 4.7 GB per side (35 track zones) DVD-RAM version 2.1 (2000) – Introduces 8-cm discs with capacity of 1.46 GB per side (14 track zones) [5] [6] DVD-RAM version 2.2 (2004) divides drives and discs into two classes due to breaking compatibility: [6] [7]
Some high-speed CD and DVD drives can use CAV. [specify] It allows for shorter access times because the rotation speed (angular velocity) does not need to be changed when the laser seeks across the disc, similarly to the magnetic head of a hard disk drive. With a given angular (rotation) speed, the linear speed at the outermost track is nearly ...