Seagate BARRACUDA ST31000524AS - Manual (Page 17)

Barracuda SATA Product Manual, Rev. A 17
www.seagate.com Drive Specifications
2.3 Recording and interface technology
Interface Serial ATA (SATA)
Recording method Perpendicular
Recording density (kbits/inch max) 1413
Track density (ktracks/inch avg) 236
Areal density (Gbits/inch
2
avg) 329
Spindle speed (RPM) 7,200 ± 0.2%
Internal data transfer rate (Mb/s max) 1695
Sustained data transfer rate (MB/s max) 125
I/O data-transfer rate (MB/s max) 600
2.4 Physical characteristics
Maximum height
1000 and 750GB models 26.1mm / 1.028 in
500, 320, 250 and 160GB models 19.98mm / 0.787 in
Maximum width 101.6mm / 4.000 (+ 0.010 in)
Maximum length 146.99mm / 5.787 in
Typical weight
1000 and 750GB models 622g / 1.371 lb
500, 320, 250 and 160GB models 415g / 0.915 lb
Cache buffer
1000 and 750GB models 32MB (32,768kb)
500 and 320GB models 16MB (16,384kb)
250 and 160GB models 8MB (8,192kb)
2.5 Seek time
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using
drive diagnostics. The specifications in the table below are defined as follows:
• Track-to-track seek time is an average of all possible single-track seeks in both directions.
• Average seek time is a true statistical random average of at least 5,000 measurements of seeks between
random tracks, less overhead.
Typical seek times (ms) Read Write
Track-to-track 1.0 1.2
Average 8.5 9.5
Average latency: 4.16