Compaq 4120T, 4130T, 4150T, 4140T, 4131T, 4200, 4125T, 4160T, 4125D CD-ROM Drives, 20X Max CD-ROM Drive

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6.5 CD-ROM Drives

	Table 6-9
	20X Max CD-ROM Drive
Applicable Disc	CD-ROM mode 1, mode 2
	CD-Digital Audio
	CD-XA mode 2 (Form 1, Form 2)
	CD-I mode 2 (Form1, Form 2)
	CD-I Ready
	CD-Bridge
	CD-WO (fixed/variable packets)
	Photo CD (singlemultisession)
Center Hole Diameter	15 mm
Disc Diameter	12 cm, 8 cm
Disc Thickness	1.2 mm
Track Pitch	1.6 μm
Laser
Beam Divergence	53.5 ± 1.5 degrees
Output Power	0.13 ± 0.1 mw
Type	Semiconductor Laser GaA1As
Wave Length	780 nm ± 25 nm
Access time
Random	<150 ms
Full Stroke	<600 ms
Audio output level
Line Out	0.7 Vrms
Headphone	None
Cache buffer	256 KB
Data transfer rate
Sustained, quad	300 MB/sec
Sustained, single	150 KB/sec
Burst	8.3 MB/sec
Startup Time	<10 seconds typical
Capacity
Mode 1, 12 cm	550 MB
Mode 2, 12 cm	640 MB
8 cm	180 MB

6-10 Specifications