In computer jargon, the speed at which data is written to (or read from) an optical disc (like a CD or a DVD) is shown as a multiple of X. For example, writing to a DVD at 8X will take less time than writing to it at 4X.[1]
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CD versus DVD writing speeds
Modern Compact Discs support a writing speed of 52X and higher, and some modern DVDs support writing at 16X or higher. It is important to notice that the speed of 1X in CD writing is not the same as the speed of 1X when writing to a DVD. When writing to a DVD at 1X, the data is transferred at a speed of approximately 1380 Kilobytes per second[2]; in contrast, writing to a CD at 1X speed results in a data transfer of approximately 150 Kilobytes per second. Thus, in brief, one X in DVD writing speeds is about 8 times more than one X in CD writing speeds. However, these speeds are not constant, and depend on the type of data written to the disc.[3]
Theoretical versus practical writing speed
Almost all of the modern CD/DVD burning software support selection of the speed at which the portable disc is written to. However, the option a user choses only defines the theoretical maximum of disc burning process. There are other factors that influence the time taken for a disc to be written to:
- Resources available to the program: Burning data to a disc consumes moderate to high level of system resources (including memory and CPU resources), and running other programs at the same time may force the CD/DVD drive to choose a lower speed automatically, to accommodate with the available resources.
- Disc quality: Optical disc recorders detect the available speed options based on the data which is available on the disc itself; however, some low quality discs make a high speed option available to the sotware, while the burning process can never reach that speed in act.
- The burning process does not happen at a steady speed. During this process, data flow speed varies based on the position of the writer's head on the disc.
Choosing the best writing speed
Choosing a higher writing speed will result in a faster disc burn, but the quality of the product will be lower. It is generally suggested to burn discs at a lower speed to make them last longer.[4][5]
See also
References
- ^ What is Read Speed? What is Write Speed?. MISCO. Retrieved on 2007-09-08.
- ^ Undrastanding DVD recording speed. Optical Storage Technology Association. Retrieved on 2007-09-08.
- ^ Undrastanding CD-R and CD-RW recording speed. Optical Storage Technology Association. Retrieved on 2007-09-08.
- ^ Why does the speed at which you burn a CD make a difference?. SoundOnSound. Retrieved on 2007-09-08.
- ^ Which write speed should I use?. feurio. Retrieved on 2007-09-08.
