Compaq D310 manual Digital Versatile Disk DVD Technology

System Features

• Supported DVD-ROM formats:.

• DVD-ROM

• DVD-R (4.7GB/3.9GB)

• DVD-RW

• DVD + RW.

	• Interface: E-IDE/ATAPI, Support Ultra DMA 66.
			Description
		Data Capacity: Capacity DVD-ROM	Up to 8.5 GB/side
		Capacity DVD-RAM	4.7 GB/side
		Capacity DVD-R	4.7 GB/side
		Capacity CD	650 MB
		Data Transfer Rate	16✕ (maximum) DVD
			40✕ (maximum) CD-ROM
		Loading Type	Motorized tray
		Access Time	120 ms (DVD)
			90 ms (CD-ROM)
		Buffer Memory Size	512 KB
		Acoustic Noise	52 dB
		Rotational Speed	Approx. Variable (Approx 7,300 rpm max.)
NOTE	If a disk is still in the drive after power failure or drive failure, the disk can be reclaimed by inserting a straightened paper-
	clip into the small hole at the bottom of the door.

Digital Versatile Disk (DVD) Technology

Digital Versatile Disc (DVD) is a medium for the distribution of from 4.7 to 17GB of digital data on a

120-mm (4.75 inch) disc. This huge volume of data (CD-ROMs can store 680MB) can be used to store up to nine hours of studio quality video and multi-channel surround-sound audio, highly interactive multimedia computer programs, 30 hours of CD-quality audio, or anything else that can be represented as digital data.

A DVD looks like a CD-ROM: it is a silvery disc, 4.75 inches in diameter, with a hole in the center. Like a CD, data is recorded on the disc in a spiral trail of tiny pits, and the discs are read using a laser beam. The DVD's larger capacity is achieved by making the pits smaller and the spiral tighter, and by recording the data in as many as four layers, two on each side of the disc.

To read these tightly packed discs, lasers that produce a shorter wavelength beam of light are required, as are more accurate aiming and focusing mechanisms. In fact, the focusing mechanism is the technology that allows data to be recorded on two layers. To read the second layer, the reader simply focuses the laser a little deeper into the disc, where the second layer of data is recorded.

Not only are two layer discs possible, but so are double-sided discs. The availability of four layers is what gives DVD its 17GB capacity.

Evo D310 Micro Desktop 27