Toshiba T2150 series, Maintenance Manual

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T2150 Series 1-9
1.4 2.5-inch Hard Disk Drive
The Hard Disk Drive (HDD) is a random access non-volatile storage device. It has a non-
removable 2.5-inch magnetic disk and mini-winchester type magnetic heads.
The T2150 series supports 260 million bytes (250MB) (TEG only) and 520 million bytes
(500 MB) drive.
The T2150 series HDD is shown in figure 1-4. Specifications for the HDD are described in
table 1-2.
Figure 1-4 2.5-Inch HDD
Table 1-2 2.5-inch HDD specifications
250 MB 500 MB
(MK1724FCV) (IBM-DBOA-2528)
Physical specifications
Formatted capacity (Mbytes) 262 528
Number of disks 2 2
Data heads 16 16
Data surfaces 4 3
Tracks per surface 842 1,024
Sectors per track 38 63
Bytes per sector 512 512
Access time (ms)
Track to track
3 3
Average 13 13/14 (R/W)
Maximum 25 23/24 (R/W)
Rotation speed (rpm) 4,000 4,000
Data transfer rate (bps)
To/from media
18.9 to 31.6 M 26.9 to 39.5 M
Interleave 1:1 1:1
Recording method 1-7 RLL 1-7 RLL