4
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
Table 1: Drive specifications for 400 Gbyte models
Drive specification ST3400832AS ST3400632AS
Formatted Gbytes (512 bytes/sector)* 400
Guaranteed sectors 781,422,768
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density in BPI (bits/inch max) 763,000
Track density TPI (tracks/inch avg) 120,000
Areal density (Mbits/inch2 avg) 91,560
Spindle speed (RPM) 7,200
Internal data transfer rate (Mbytes/sec max) 95
Sustained transfer rate OD (Mbytes/sec) 65
I/O data transfer rate (Mbytes/sec max) 150
ATA data-transfer modes supported PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
SATA data-transfer modes supported 1.5 Gbits/sec
Cache buffer 8 Mbytes 16 Mbytes
Height (max) 26.11 mm (1.028 inches)
Width (max) 101.85 mm (4.010 inches)
Length (max) 146.99 mm (5.787 inches)
Weight (max) grams / lb. 635 / 1.39
Average latency (msec) 4.16
Power-on to ready (typical) 10 sec
Standby to ready (typical) 10 sec
Track-to-track seek time (msec typical) 0.8 (read), 1.0 (write)
Average seek, read (msec typical) 8.0
Average seek, write (msec typical) 9.0
Startup current (typical) 12V (peak) 2.8 amps
Voltage tolerance
(including noise)
5V ± 5%
12V ± 10%
Ambient temperature 0° to 60°C (op.)
–40° to 70°C (nonop.)
Temperature gradient
(°C per hour max)
20°C (operating)
30°C (nonoperating)
Relative humidity 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max