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Optical drives for computers come in two main form factors: half-height (also known as desktop drive) and slim type (used in laptop computers and compact desktop computers). They exist as both internal and external variants. Half-height optical drives are around 4 centimetres tall, while slim type optical drives are around 1 cm tall.
A 5.25-inch DVD drive. 5.25-inch drive bays are divided into two height specifications, full-height and half-height. Full-height bays were found in old PCs in the early to mid-1980s. They were 3 + 1 ⁄ 4 inches (82.6 mm) high, 5 + 3 ⁄ 4 inches (146.1 mm) wide, and up to 8 inches (203.2 mm) deep, used mainly for hard disk drives and floppy ...
But a second write-once format DVD+R emerged in 2002, leading to a brief format war before dual format drives became common. A read-write format, DVD-RW, was introduced in 1999, but like earlier CDs it could not be read by "normal" DVD drives. Over time, improvements led to most newer DVD drives being able to read any of these media. [15]
Slim HD DVD Reader + DVD Writer Combo PC drive (OEM usage only) December 2007 SD-L902A Toshiba: Slim HD DVD Writer PC drive HD DVD-R, HD DVD-R DL [56] (OEM usage only) (OEM p/n P000486270 [57] Used in the Qosmio PQG40A-00Y014 [58] Mfr'd May 2007 [59] - Oct 2007 [60] SD-L912A Toshiba: Slim HD DVD-ReWritable Drive. HD DVD-RW and HD DVD-R DL writer.
The DVD and Blu-ray discs hold a higher capacity of data, so reading or writing those discs in the same 74-minute time-frame requires a higher data transfer rate. Drive speed can be limited intentionally to reduce noise from the drive or slow down ripping, such as the firmware component Riplock.
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What remained (in the ThinkPad W540 product) was an option for a removable Serial ATA (SATA) "Caddy" accessory which, with a screw driver, allowed the optical drive to be replaced with a second 2.5 inch SATA storage device. Battery expansion in the caddy bay was no longer offered, and earlier hot-swap functionality was essentially rendered ...
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