Momentus 42 Product Manual, Rev. A
3
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
ST94019A, ST93015A, and ST92014A model drives.
2.1
Specification summary
The specifications listed in this table are for quick reference. For details on specification measurement or defi-
nition, see the appropriate section of this manual.
Table 1:
Specifications
Drive specification
ST94019A
ST93015A
ST92014A
Formatted Gbytes (512 bytes/sector)
40
30
20
Guaranteed sectors
78,140,160
58,605,120
39,070,080
Bytes per sector
512
Physical read/write heads
2
2
1
Discs
1
Cache (Mbytes)
2
Recording density, BPI (bits/inch max)
642,000
577,000
642,000
Track density. TPI (tracks/inch max)
100,780
Areal density (Bbits/inch
2
max)
65
58
65
Spindle speed (RPM)
4,200-class performance
(spin speed actually 5,400 RPM)
Internal data transfer rate OD (Mbytes/sec max)
48.25
46.05
48.25
Sustained data transfer rate OD (Mbytes/sec)
31.0
I/O data-transfer rate (Mbytes/sec max)
100
ATA data-transfer modes supported
PIO modes 0–4;
Multiword DMA modes 0–2;
Ultra DMA modes 0–5
Height
9.5 +/-0.2 mm (0.374 +/-.0078 inches)
Width
69.85 +/-0.25 mm (2.75 +/-0.0098 inches)
Length
100.2 +/-0.25 mm (3.945 +/-0.0098 inches)
Weight (typical)
99 grams (0.218 lb)
Average latency (msec)
5.6
Power-on to ready (sec typical)
3.9
Standby to ready (sec typical)
2.5 sec
Startup current 5V (peak)
1.2 amps
Track-to-track seek time (msec typical)
1.5 (read), 2.0 (write)
Average seek time (msec typical)
12.0
Average seek, read (msec typical)
12.0
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