Seagate Specifications
      Show Part Numbers

Feature Description
Manufacturer Seagate
Model ST9120821AS
Formatted Gbytes (512 bytes/sector) 120
Guaranteed sectors 234,441,648
Bytes per sector 512
Physical read/write heads 3
Disks 2
Cache (Mbytes) 8
Recording density (maximum) 870,000 bits per inch (BPI)
Track density (maximum) 150,000 tracks per inch ( TPI)
Areal density (maximum) 132 Gbits per inch
Spindle speed (RPM) 5,400 RPM
Internal data transfer rate OD (maximum) 352 Mbytes per second
I/O data-transfer rate 150 Mbytes per second
ATA data-transfer modes supported SATA 1.0, SATA II
PIO modes 0-4
Multiword DMA modes 0-2
Ultra DMA modes 0-6
Latency (average) 5.6 milliseconds (ms)
Power-on to ready (typical) 3.0 seconds
Standby to ready (typical) 3.0 seconds
Track-to-track seek time (typical) 1.0 (read), 1.5 (write) msec
Average seek, read (typical) 12.5 msec
Average seek, write (typical) 14.5 msec
Full-stroke seek (typical) 22 msec
Power
Requirement +5VDC(±5%)
Seek (typical) 2.2 W
Read (typical) 1.9 W
Write (typical) 2.3 W
Idle (typical) 0.8 W
Standby (typical) 0.2 W
Sleep (typical) 0.2 W
Environmental
Ambient temperature (operating) 5 to 60° C
Ambient temperature (non-operating) -40 to 70° C
Relative humidity (non-condensing) (operating) 5% - 90%
Relative humidity (non-condensing) (non-operating) 5% - 95%
Maximum wet bulb (non-condensing) (operating) 30° C
Maximum wet bulb (non-condensing) (non-operating) 40° C
Altitude, operating -304.8 m to 3,048 m (-1000 ft to 10,000+ ft)
Altitude, nonoperating (meters below mean sea level,max)-304.8 m to 12,192 m (-000 ft to 40,000+ ft)
Shock (operating) 350 Gs maximum at 2 msec
Shock (non-operating) 800 Gs maximum at 2 msec
Error rate (non-recoverable) <1 per 1014 bits transferred
Load/unload cycle 600,000
Physical
Height (mm) 9.5
Width (mm) 69.85
Depth (mm) 100.5
Weight (grams) 100