Compaq CQ20 manual System DMA specifications, Hardware DMA System function

Specifications

DVD±RW and CD-RW SuperMulti Double-Layer Drive and DVD±RW and CD-RW SuperMulti Double-Layer Drive with LightScribe specifications

	Applicable disc		Read:	Write:
			CD-ROM, CD-R, CD-RW, High	DVD-RAM (Ver.2), DVD±R,
			Speed CD-RW, Ultra & Ultra+	DVD±RW, DVD±Dual, CD-R,
			Speed CD-RW, DVD,	and CD-RW
			DVD±R/RW, DVD±R,
			DVD-RAM
	Access time		CD	DVD
	Random		< 130 ms	< 150 ms
	Cache buffer		2 MB
	Data transfer rate
	5X DVD-RAM		6,750 KB/sec
	8X DVD±RW		10,800 KB/sec
	8X DVD±R		10,800 KB/sec
	16X CD-R		3,600 KB/sec
	16X CD-RW (High Speed)		1,500 KB/sec
System DMA specifications
	Hardware	DMA System function
	DMA0	Not applicable
	DMA1*	Not applicable
	DMA2*	Not applicable
	DMA3	Not applicable
	DMA4	Direct memory access controller
	DMA5*	Not applicable
	DMA6	Not assigned
	DMA7	Not assigned
	*PC Card controller can use DMA 1, 2, or 5.

6–4 Maintenance and Service Guide