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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. As faster drives were released, the write speeds and read speeds for optical discs were multiplied by manufacturers, far exceeding the drive speeds originally released onto the market.
DVD lens supports a different focus for CD or DVD media with same laser. With the newer Blu-ray Disc drives, the laser only has to penetrate 0.1 mm of material. Thus the optical assembly would normally have to have an even greater focus range. In practice, the Blu-ray optical system is separate from the DVD/CD system.
Sometimes disc images are even used to emulate the presence of a CD-ROM or DVD drive with the data entirely resident on the hard disc. For the command-line tool cdrdao , a so-called TOC file that can be authored inside a text editor is used to specify the details of the desired disc record.
5 Computers that shipped with HD DVD/DVD/CD or Blu-ray/HD DVD/CD/DVD ... Download as PDF; Printable version ... Laptop Computer with HD DVD-ROM drive HP Pavilion ...
In CAV mode the "×" number denotes the transfer rate at the outer edge of the disc, where it is a maximum. 20× was thought to be the maximum speed due to mechanical constraints until Samsung Electronics introduced the SCR-3230, a 32× CD-ROM drive which uses a ball bearing system to balance the spinning disc in the drive to reduce vibration ...
The project was the brainchild of Josh Hogan, who represented HP and was involved in the negotiations that resulted in the compromise format for DVD-ROM (prerecorded media) between the DVD Forum and the Sony & Philips teams. HP chose to partner with Sony and Philips, who were initially lukewarm to a fully rewritable format.
Sony Rewritable DVD A DVD-ROM drive for a PC. HP initially developed recordable DVD media from the need to store data for backup and transport. [61] [failed verification] DVD recordables are now also used for consumer audio and video recording. Three formats were developed: DVD-R/RW, DVD+R/RW (plus), and DVD-RAM.
PSI Media and Fulfillment Services; Pandisk Technologies [20]; Philips; Plasmon Data Systems (Defunct in late 1990's) [21] Prodisc; Pressing-Media www.pressing-media.com