Datasheet

14 Barracuda SATA Product Manual, Rev. A
Drive Specifications www.seagate.com
2.4 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
2.5 Physical characteristics
Maximum height
19.98mm / 0.787 in
500, 320 and 250GB models
Maximum width 101.6mm / 4.000 (+ 0.010 in)
Maximum length 146.99mm / 5.787 in
Typical weight
500, 320 and 250GB models 415g / 0.915 lb
Cache buffer
500, 320 and 250GB models 16MB (16,384kb)
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.
Typical seek times (ms) Read Write
Track-to-track 1.0 1.2
Average 8.5 9.5
Average latency 4.16
Note
These drives are designed to consistently meet the seek times represented in this manual.
Physical seeks, regardless of mode (such as track-to-track and average), are expected to meet
the noted values. However, due to the manner in which these drives are formatted, benchmark
tests that include command overhead or measure logical seeks may produce results that vary
from these specifications.