Seagate ST950814A ユーザーズマニュアル

Momentus 4200.2 Product Manual, Rev. C

3

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 
ST9120824A, ST9100825A, ST980829A, ST960812A, ST950814A, ST9402112A, and ST930218A model 
drives.

The specifications listed in this table are for quick reference. For details on specification measurement or 
definition, see the appropriate section of this manual.

Formatted Gbytes (512 bytes/sector)*

120

100

80

Guaranteed sectors

234,441,648

195,371,568

156,301,488

Bytes per sector

512

Physical read/write heads

4

4

3

Discs

2

2

2

Cache (Mbytes)

8

Recording density, BPI (bits/inch typical)

778k

Track density. TPI (tracks/inch typical

126k

Areal density (Gbits/inch

2 

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 modes 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