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Chapter 2 System Overview
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
2-14
Table 2–7. Diskette Drive Specifications
Table 2-7.
Diskette Drive Specifications
Paramemter Measurement
Media Type 3.5 in 1.44 MB/720 KB diskette
Height 1/3
Bytes per Sector 512
Sectors per Track:
High Density
Low Density
18
9
Tracks per Side:
High Density
Low Density
80
80
Read/Write Heads 2
Average Access Time:
Track-to-Track (high/low)
Average (high/low)
Settling Time
Latency Average
3 ms/3 ms
94 ms/94ms
15 ms
100 ms
Table 2–8. 8x CD-ROM Drive Specifications
Table 2-8.
20x CD-ROM Drive Specifications
Paramemter Measurement
Media Type Mode 1,2, Mixed Mode, CD-DA,
Photo CD, Cdi, CD-XA
Center Hole Diameter 15 mm
Disc Diameter 8/12 cm
Disc Thickness 1.2 mm
Track Pitch 1.6 um
Laser
Beam Divergence
Output Power
Typr
Wave Length
53.5 +/- 1.5
°
53.6 0.14 mW
GaAs
790 +/- 25 nm
Average Access Time:
Random
Full Stroke
150 ms
600 ms
Audio Output Level 0.7 Vrms
Cache Buffer 128 KB (min)
Data Transfer Time
Sustained
Startup Time
3000 KB/s
7 secs (nom)