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In the history of optical storage media there have been and there are different optical disc formats with different data writing/reading speeds.. Original CD-ROM drives could read data at about 150 kB/s, 1× constant angular velocity (CAV), [1] the same speed of compact disc players without buffering.
Unlike early CD-ROM drives, optical disc recorder drives have generally used industry standard connection protocols. Early computer-based CD recorders were generally connected by way of SCSI ; however, as SCSI was abandoned by its most significant users (particularly Apple Computer ), it became an expensive option for most computer users.
Some optical drives additionally throttle the reading speed based on the contents of optical discs, such as max. 40× CAV (constant angular velocity) for the Digital Audio Extraction (“DAE”) of Audio CD tracks, [32] 16× CAV for Video CD contents [33] and even lower limitations on earlier models such as 4× CLV (constant linear velocity ...
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.
It uses the Disc-At-Once method, usually at 1x, but some recorders allow for 4x and 8x speed mode. Since the pits and lands are longer, the quantity of information that can fit on a disc is less than with a normal method: 63 minutes instead of 74 minutes on a 650MB CD or 68 min instead 80 minutes on a 700MB CD.
Russell's first optical disc was distinctly different from the eventual compact disc product: the disc in the player was not read by laser light. A key characteristic of Russell's invention is that a laser is not used for the reading the disc, instead the entire disc or oblong sheet to be read is illuminated by a large playback light source at ...
In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to the writing speed of recordable discs. A drive or disc operating in CAV mode maintains a constant angular velocity, contrasted with a constant linear velocity (CLV).
Reading speed is 480 characters per second, up to 400 documents per minute. [31] The IBM 1418 features a CRT on the top of the unit that adds 7 + 3 ⁄ 8 in (19 cm) to the height of the machine. [32] The Model 3 is similar to a Model 1 but can handle broader paper size ranges.