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2.3.3 Disk specifications
(1) 128 MB disk
The ISO/IEC10090 defines 128 MB disk specification.
(2) 230 MB disk
The ISO/IEC13963 defines 230 MB disk specification.
(3) 540 MB/640 MB disk
The ISO/IEC15041 defines 540 MB/640 MB disk specification.
Table 2.6 lists disk specifications.
Table 2.6 Disk specifications (1 of 2)
Item Specification
Disk media 128 MB 230 MB 540 MB 640 MB
Format User zone (radius) 24 to 40 mm 23.72 to
40.99 mm
23.72 to
41.00 mm
Track shape Spiral
Track pitch
1.6±0.1µm 1.39±0.08 µm 1.10±0.05 µm
Direction of rotation Counterclockwise (viewed from lens)
Number of zones – 10 18 11
Number of logical tracks/side – 17,940 42,042 18,480
Number of logical tracks/zone – 1,380 to 2,208 1,750 to 2,772 1,260 to 2,100
Number of physical tracks/side – 11,500 15,700 15,708
Number of physical tracks/zone – 1,150 875 (825) 1,428
Number of user tracks/side 10,000 17,940 42,042 18,480
Number of sectors/track 25 17
Data block length 512 bytes 2,048 bytes
Outer diameter of disk medium 86 mm
Outer diameter of hub 15 mm
Optical disk cartridge dimensions
(W/L/H)
90/94/6 mm
Mechanical
characteristics