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2.0
Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal
power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate
ST9402115A and ST920217A model drives.
2.1
Specification summary
The specifications listed in this table are for quick reference. For details on specification measurement or
definition, see the appropriate section of this manual.
Table 1:
Specifications
Drive specification
Formatted Gbytes (512 bytes/sector)*
Guaranteed sectors
Bytes per sector
Default sectors per track
Default read/write heads
Default cylinders
Physical read/write heads
Discs
Recording density, BPI (bits/inch typical)
Track density. TPI (tracks/inch typical)
2
Areal density (Gbits/inch
max)
Spindle speed (RPM)
Internal data transfer rate OD (Mbytes/sec max)
I/O data-transfer rate (Mbytes/sec max)
ATA data-transfer modes supported
Cache buffer (Mbytes)
Height
Width
Length
Weight (typical)
Average latency (msec)
Power-on to ready (sec typical)
Standby to ready (sec typical)
Track-to-track seek time (msec typical)
Average seek, read (msec typical)
Average seek, write (msec typical)
LD25 Series PATA Product Manual, Rev. C
ST9402115A
ST920217A
40
20
82,443,600
41,021,800
512
63
16
16,383
2
1
1
1
675,900
114,000
81
5,400
57.6
100
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–5
2
9.5 +/-0.2 mm (0.374 +/-.008 inches)
69.85 +/-0.25 mm (2.750 +/-0.010 inches)
100.2 +/-0.25 mm (3.945 +/-0.010 inches)
100 grams (0.22 lb)
5.6
4.0
3.0
1.0 (read), 1.5 (write)
<16
<16
3
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