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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
ST94811AB 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
Formatted Gbytes (512 bytes/sector)
Guaranteed sectors
Bytes per sector
Physical read/write heads
Discs
Cache (Mbytes)
Recording density, BPI (bits/inch max)
Track density, TPI (tracks/inch max)
2
Areal density (Mbits/inch
max)
Spindle speed (RPM)
Internal data transfer rate OD (Mbytes/sec max)
Sustained data transfer rate OD (Mbytes/sec)
I/O data transfer rate (Mbytes/sec max)
ATA data transfer modes supported
Height
Width
Length
Weight (typical)
Average latency (msec)
Power-on to ready (sec typical)
Standby to ready (sec typical)
Startup current 5V (peak)
Track-to-track seek time (msec typical)
Average seek time (msec typical)
Average seek, read (msec typical)
Average seek, write (msec typical)
Momentus Blade Server Product Manual, Rev. A
ST94811AB
40
78,140,160
512
2
1
2
642,000
100,780
65
5,400
48.25
34.5
100
PIO modes 0–4; Multiword DMA modes 0–2; Ultra DMA modes 0–5
9.5 +/–0.2 mm (0.374 +/–.0078 inches)
69.85 +/–0.25 mm (2.75 +/–0.0098 inches)
100.2 +/–0.25 mm (3.945 +/–0.0098 inches)
99 grams (0.218 lb.)
5.6
3.9
2.6 sec
1.2 amps
1.5 (read), 2.0 (write)
12.0
12.0
14.0
3
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