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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.
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
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 ...
The data are stored on the disc with a laser or stamping machine, and can be accessed when the data path is illuminated with a laser diode in an optical disc drive that spins the disc at speeds of about 200 to 4,000 RPM or more, depending on the drive type, disc format, and the distance of the read head from the center of the disc (outer tracks ...
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 ...
To use a sound card, the operating system (OS) typically requires a specific device driver, a low-level program that handles the data connections between the physical hardware and the operating system. Some operating systems include the drivers for many cards; for cards not so supported, drivers are supplied with the card, or available for ...
If the drive has to seek forwards, the sector's original content "Jill" is returned. If the drive has to seek backwards, the sector's twin "Mary" is returned. A protected program can check whether the CD-ROM is original by positioning the drive behind sector 6553 and then reading from it — expecting the Mary version to appear.
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