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Barracuda SATA Product Manual, Rev. B 17
www.seagate.com Drive Specifications
2.4 Recording and interface technology
2.5 Physical characteristics
2.6 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.
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
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 (8192kb)
Typical seek times (ms) Read Write
T
rack-to-track 1.0 1.2
Average 8.5 9.5
Average latency 4.16