Toshiba T-Series T2000, Maintenance Manual

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1.4 2.5-inch Hard Disk Drive
The 20MB or 40MB (formatted) Hard Disk Drive (HDD) is a random access storage device. It is
equipped with a non-removal 2.5-inch magnetic disk and mini-Winchester type magnetic heads.
The two HDDs manufactured for the T2000 are shown in Figure 1-5. Their specifications are
described in Table 1-2.
JVC Conner
Figure 1-5 T2000 2.5-inch HDD
Table 1-2 T2000 2.5-inch HDD specifications
Item
20-Mbyte 40-Mbyte
JD-E2825P CP-2024 CP-2044 JD-E2850P
Storage capacity
Formatted (Mbytes)
20.4 21.4 42.5 42.52
Number of disks 1 1 2 2
Data heads 2 2 4 3
Data surfaces 2 2 4 3
Tracks per surface 581 653 552 791(+2)
Tracks per drive 1,162 1,306 2,208 2,373(+6)
Sectors per track 36 32(+1) 38(+1) 35(+1)
Bytes per sector 512 512 512 512
Access time (ms)
Track to track
Average
Maximum
9
25
47
5
23
40
5
19
40
9
25
47
Rotation speed (rpm) 3,109 3,444 3,486 3,109
Data transfer rate
To/from media (bps)
10 M 10 M 12 M 10 M
Interleave 1:1 1:1 1:1 1:1
Recording method 2-7 RLL 2-7 RLL 2-7 RLL/
1-7 RLL
2-7 RLL