Seagate ST31500341AS Barracuda 7200.11 SATA Product Manual - Page 17
Physical characteristics, Seek time - benchmark
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2.4 Physical characteristics Maximum height 1500, 1000 and 640 GB models 320 and 160 GB models Maximum width Maximum length Typical weight 1500 GB models 1000 GB models 640 GB models 320 GB models 160 GB models Cache buffer ST31500341AS, ST31000333AS and ST3640323AS ST3640623AS and ST3320613AS ST3320813AS and ST3160813AS 26.1 mm (1.028 inches) 20.17 mm (0.794 inches) 101.6 mm (4.000 +/- 0.010 inches) 146.99 mm (5.787 inches) 720 grams (1.587 lbs) 677 grams (1.493 lbs) 543 grams (1.199 lbs) 405 grams (0.893 lbs) 390 grams (0.860 lbs) 32 Mbytes (32,768 kbytes) 16 Mbytes (16,384 kbytes) 8 Mbytes (8,192 kbytes) 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 (msec) Track-to-track Average* (1500, 1000 and 640 GB models) Average** (320 and 160 GB models) Average latency: *Measured in performance mode. **Measured in quiet mode. Read