Apple 17-INCH manual SuperDrive DVD-R /CD-RW, Media type Reading speed maximum Writing speed

CHAPTER 3

Devices and Ports

Signal name	Signal description
/DIOW	I/O data write strobe.
/DMACK	Used by the host to initiate a DMA transfer in response to DMARQ.
DSTROBE	Strobe for Ultra DMA data transfers to host.
/HDMARDY	Ultra DMA data ready.
HSTROBE	Strobe for Ultra DMA data transfers from host.
IORDY	I/O ready; when driven low by the drive, signals the CPU to insert wait states into the I/O
	read or write cycles.
/IOCS16	I/O channel select; not used on this computer.
DMARQ	Asserted by the device when it is ready to transfer data to or from the host.
INTRQ	Interrupt request. This active high signal is used to inform the computer that a data transfer
	is requested or that a command has terminated.
/PDIAG	Asserted by device 1 to indicate to device 0 that it has completed the power-on diagnostics;
	not available on this computer (n.c.).
/RESET	Hardware reset to the drive; an active low signal.
/STOP	Stop request; an active low signal.
Key	This pin is the key for the connector.

The built-in ATA devices are connected to the I/O bus through bidirectional bus buffers.

SuperDrive (DVD-R /CD-RW)

The PowerBook G4 17-inch computer has a slot-loading DVD-R/CD-RW SuperDrive.

The SuperDrive can read and write DVD media and CD media, as shown in Table 3-8. The DVD-R/CD-RW drive also provides DVD-Video playback. The G4 microprocessor provides the MPEG-2 decoding.

Table 3-8Media read and written by the SuperDrive

Media type	Reading speed (maximum)		Writing speed
DVD-R	4x	(CAV max)	1x (CLV)
DVD-ROM	8x	(CAV max, single layer) 6x (CAV max, dual layer)	_
CD-R	24x (CAV max)		8x (CLV)
CD-RW	12x (CAV max)		4x (CLV)
SuperDrive (DVD-R /CD-RW)			37

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