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Momentus 5400.1 Product Manual, Rev. F
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
ST94011A, ST92011A, ST92811A, and ST94811A 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 ST94011A ST94811A ST92011A ST92811A
Formatted Gbytes (512 bytes/sector) 40 40 20 20
Guaranteed sectors 78,140,160 78,140,160 39,070,080 39,070,080
Bytes per sector 512
Physical read/write heads 2 2 1 1
Discs 1 1 1 1
Cache (Mbytes) 2 8 2 8
Recording density, BPI (bits/inch max) 642,000
Track density. TPI (tracks/inch max) 100,780
Areal density (Mbits/inch
2
max) 65
Spindle speed (RPM) 5,400
Internal data transfer rate OD (Mbytes/sec max) 48.25
Sustained data transfer rate OD (Mbytes/sec) 34.5
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) 2.6 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
Average seek, write (msec typical) 14.0