SV35 Series SATA Product Manual, Rev. D 5

Table 2: Drive specifications summary for the 1TB models
Drive specification ST31000526SV ST31000525SV
Formatted capacity (512 bytes/sector)* 1TB 1TB
Guaranteed sectors 1,953,525,168 1,953,525,168
Heads 4 4
Disks 2 2
Bytes per sector 512 512
Default sectors per track 63 63
Default read/write heads 16 16
Default cylinders 16,383 16,383
Recording density(max) 1474 kb/in 1474 kb/in
Track density (avg) 236 ktracks/in 236 ktracks/in
Areal density (avg) 345 Gb/in2 345 Gb/in2
Internal data transfer rate (max) 1628 Mb/s 1628 Mb/s
Sustained data transfer rate (max) 140 MB/s 140 MB/s
I/O data-transfer rate (max) 600 MB/s 300 MB/s
ATA data-transfer modes supported PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Cache buffer 32MB 32MB
Height (max) 26.11mm (1.028 in) 26.11mm (1.028 in)
Width (max) 101.6mm (4.0 in) 101.85mm (4.010 in)
Length (max) 146.99mm (5.787 in) 146.99mm (5.787 in)
Weight (typical) 677g (1.493 lb) 677g (1.493 lb)
Power-on to ready(max) <10s <10s
Track-to-track seek time <1.0ms (typical read)
<1.2ms (typical write)
<1.0ms (typical read)
<1.2ms (typical write)
Average seek, read (typical) <12ms <12ms
Average seek, write (typical) <13ms <13ms
Startup current (typical) 12V (peak) 2.0A 2.0A
Voltage tolerance (including noise) 5V ± 5%
12V ± 10%
5V ± 5%
12V ± 10%
Operating temperature (Drive Case) 0° to 70°C 0° to 70°C
Nonoperating temperature
(Drive Case)
–40° to 70°C –40° to 70°C
Temperature gradient (max) 20°C per hour max (operating)
30°C per hour max (nonoperating)
20°C per hour max (operating)
30°C per hour max (nonoperating)
Relative humidity 5% to 90% (operating)
5% to 95% (nonoperating)
5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient (max) 30% per hour 30% per hour
Wet bulb temperature (max) 37.7°C (operating)
40.0°C (nonoperating)
37.7°C (operating)
40.0°C (nonoperating)
Altitude, operating –60.96m to 3,048m
(–200 ft. to 10,000+ ft.)
–60.96m to 3,048m
(–200 ft. to 10,000+ ft.)
Altitude, nonoperating
(below mean sea level, max)
–60.96 m to 12,192 m
(–200 ft. to 40,000+ ft.)
–60.96 m to 12,192 m
(–200 ft. to 40,000+ ft.)
Operational Shock (max) 63 Gs at 2ms 63 Gs at 2ms
Non-Operational Shock (max) 300 Gs at 2ms 300 Gs at 2ms