Momentus 4200.2 Product Manual, Rev. C
Table 1: Specifications for 60, 50, 40, and 30 GB models

Drive specification ST960812A ST950814A ST9402112A ST930218A

Formatted Gbytes (512 bytes/sector)* 60 50 40 30
Guaranteed sectors 117,210,240 97,692,174 78,140,160 58,605,120
Bytes per sector 512
Physical read/write heads 2 2 2 1
Discs 1 1 1 1
Cache (Mbytes) 8
Recording density, BPI (bits/inch typical) 778k
Track density. TPI (tracks/inch typical 126 k
Areal density (Gbits/inch2 max) 98.2
Spindle speed (RPM) 4,200 RPM-class performance (actual spin speed: 5,400 RPM)
Internal data transfer rate OD (Mbytes/sec max) 37
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 m odes 0–5
Height 9.5 +/–0.2 mm (0.374 +/–.008 inches)
Width 69.85 +/–0.25 mm (2.750 +/–0.010 inches)
Length 100.2 +/–0.25 mm (3.945 +/–0.010 inches)
Weight (typical) 100 grams (0.22 lb)
Average latency (msec) 5.6
Power-on to ready (sec typical) 3.5
Standby to ready (sec typical) 3.0
Startup current 5V (typical) 1.0 amps
Track-to-track seek time (msec typical) 1.0 (read), 1.5 (write)
Average seek time (msec typical) 12.5
Average seek, read (msec typical) 12.5
Average seek, write (msec typical) 14.5
Full-stroke seek (msec) 22 (typical); 24 (max)
Seek power (typical) 2.00 watts
Read/write power (typical) Read: 1.80 watts; Write: 1.80 watts
Idle mode (low power, typical) 0.80 watts
Standby mode 0.26 watts (typical)***
Sleep mode 0.26 watts (typical)***
Voltage tolerance (including noise) 5V ± 5%
Ambient temperature 5° to 55°C (operating)
–40° to 70°C (nonoperating)
Temperature gradient
(°C per hour max, noncondensing) 20°C (operating)
30°C (nonoperating)
Relative humidity
(noncondensing) 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature (°C max) 30°C (oper ating)
40°C (nonoperating)
Altitude, operating –30 4.8 m to 3,048 m (–1000 ft to 10,000 ft)
Altitude, nonoperating (below mean sea level, max) –304.8 m to 12,192 m (–1,000 ft to 40,000 ft)
Shock, operating (Gs max at 2 msec) 250