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7-12
Physical and Operating Systems
DVD-ROM Drive
Table 7-9
DVD-ROM Drive
Disc
Applicable Disc Formats
DVD (Single and Double layer)
CD-ROM (Mode 1 & 2)
CD-DA
CD-XA (Mode 2, Form 1 & 2)
CD-I (Mode 2, Form 1 & 2)
CD-I Ready, CD-Bridge, CD-R
PhoteCD (Single & Multi Session)
Diameter (cm)
12 and 8
Capacity
4.70 GB
8.54 GB
9.40 GB
550 MB (Mode 1, 12 cm)
640 MB (Mode 2, 12 cm)
180 MB (8 cm)
Thickness
1.2 mm (CD-ROM, DVD)
Track Pitch
1.6
µ
m (CD-ROM)
0.74
µ
m (DVD)
Performance
Block Size (bytes)
Mode 0: 2352
Mode 1: 2352, 2340, 2336, 2048
Mode 2: 2352, 2340, 2336, 2048
DVD: 2048
Typical Access Time
DVD: <180ms (random), <300 ms (full stroke)
CD: <120ms (random), <200 ms (full stroke)
Data Transfer Rate
150 kB/s (sustained, 1x CD-ROM mode)
1200-4800 kB/s (32x CAV CD-ROM mode)
2705-8115 kB/s (6x CAV DVD mode)
Bus Rate
16.6 Mbytes/s (burst) with DMA support
Cache/Buffer
512 kB minimum
Typical Start-up Time
<10 s
Typical Stop Time
<3 s
Error Rates
10
-15
(soft error)
10
-20
(hard error)
10
-6
(seek error)
Reliability
35,000 POH, 25% (MTBF)
30 minutes (MTTR)
>20,000 drawer in/out cycles
>5x10
6
full stroke seeks
Indicators
Busy LED (amber or green)
Continued