Seagate ST9500620NS, ST9500622NS manual Drive specifications summary for 1TB, 500 and 250 GB models

Table 1:	Drive specifications summary for 1TB, 500 and 250 GB models
Drive specification		ST91000640NS	ST9500620NS	ST9250610NS
		ST91000641NS	ST9500621NS	ST9250611NS
		ST91000642NS	ST9500622NS	ST9250612NS
Formatted GB (512 bytes/sector)*		1000	500	250
Guaranteed sectors		1,953,525,168	976,773,168	488,397,168
Heads		8	4	2
Discs		4	2	1
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density, KBPI (Kb/in max)		1544
Track density, KTPI (Ktracks/in avg.)		270
Areal density, (Gb/in2 avg)		417
Spindle speed (RPM)		7200
Internal data transfer rate (Mb/s max)		1304
Sustained data transfer rate OD (MB/s max)		115
I/O data-transfer rate (MB/s max)		600
ATA data-transfer modes supported		PIO modes 0–4
		Multiword DMA modes 0–2
		Ultra DMA modes 0–6
Cache buffer		64 Mbytes
Height (mm max)		14.8 mm (0.583 in)
Width (mm max)		70.0 mm (2.76 in)
Length (mm max)		100.5 mm (3.957 in)
Weight (max)		200 g (0.441 lb)	183 g (0.403 lb)	179 g (0.395 lb)
Average latency		4.16 ms
Power-on to ready (sec max)		20 sec
Standby to ready (sec max)		13 sec
Track-to-track seek time (ms typical)		0.7 read; 0.85 write
Average seek, read (ms typical)		8.5
Average seek, write (ms typical)		9.5
Startup current (typical) 12V (peak)		2.0 amps
Voltage tolerance (including noise)		5V +10 / -7.5%
		12V +10 / -7.5%
Ambient temperature		5° to 60°C (operating)
		–40° to 70°C (nonoperating)
Temperature gradient (°C per hour max)		20°C (operating)
		20°C (nonoperating)
Relative humidity		5% to 95% (operating)
		5% to 95% (nonoperating)
Relative humidity gradient		20% per hour max
Wet bulb temperature (°C max)		28°C
Altitude, operating		–60.96 m to 3,048 m
		(–200 ft. to 10,000+ ft.)
Altitude, nonoperating		–60.96 m to 12,192 m
(below mean sea level, max)		(–200 ft. to 40,000+ ft.)
Operational Shock (max at 2 ms)		Read 70 Gs / Write 40 Gs
Non-Operational Shock (max at 2 ms)		400 Gs

Constellation.2 Serial ATA Product Manual, Rev. B 5