Compaq 850 manual 48x CD-ROM Drive Specifications SP# 187217-B21, Hard Drive Specifications

Chapter 2 System Overview

Table 2-9.48x CD-ROM Drive Specifications

Table 2-9.

48x CD-ROM Drive Specifications

(SP# 187217-B21)

Parameter	Measurement
Interface Type	IDE
Transfer Rate:
Max. Sustained	4800 KB/s
Burst	16.6 MB/s
Media Type	Mode 1,2, Mixed Mode, CD-DA,
	Photo CD, Cdi, CD-XA
Capacity:
Mode 1, 12 cm	550 MB
Mode 2, 12 cm	640 MB
8 cm	180 MB
Center Hole Diameter	15 mm
Disc Diameter	8/12 cm
Disc Thickness	1.2 mm
Track Pitch	1.6 um
Laser
Beam Divergence	53.5 +/- 1.5 °
Output Power	53.6 0.14 mW
Type	GaAs
Wave Length	790 +/- 25 nm
Average Access Time:
Random	<100 ms
Full Stroke	<150 ms
Audio Output Level	0.7 Vrms
Cache Buffer	128 KB

Table 2-10.Hard Drive Specifications

Table 2-10.

Hard Drive Specifications

Parameter	18.0 GB	20.0 GB	40.0 GB
Drive Size	3.5”	3.5”	5.25”
Interface	Ultra 160 SCSI	UATA/100	UATA/100
Drive Protection System Support?	Yes	Yes	Yes
Transfer Rate (max)	160 MB/s	100 MB/s	100 MB/s
Typical Seek Time (w/settling) [1]
Single Track	1.7 ms	2.0 ms	1.0 ms
Average	8.5 ms	9.5 ms	9.0 ms
Full Stroke	15 ms	21 ms	20 ms
Disk Format (logical):
# of Cylinders	16383	16383	16383
# of Data Heads	16	16	16
# of Sectors per Track	63	63	63
Rotation Speed	10,000 RPM	7200 RPM	7200 RPM
Drive Fault Prediction	SMART III	SMART III	SMART III

NOTE:

Actual times may vary depending on specific drive installed. All EMEA units feature Quiet Drives.

[1] Operates at 66 MB/s in these systems.

2-16Compaq Deskpro EXS and Workstation 300 Personal Computers

Featuring the Intel Pentium 4 Processor

First Edition – December 2000