6
Barracuda ATA II 100 Family Product Manual, Rev. A
1.3 Recording and interface technology
1.4 Physical characteristics
1.5 Seek time
Seek measurements are taken with nominal power at 25°C ambient
temperature. All times are measured using drive diagnostics. The spec-
ifications 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
ATA
Recording method
16/17 EPRML
Recording density BPI (bits/inch)
357,452
Track density TPI (tracks/inch)
21,368
Areal density (Mbits/inch
2
max)
7,638
Spindle speed (RPM) (
±
0.2%)
7,200
Internal data-transfer rate
(Mbits/sec max)
364
I/O data-transfer rate
(Mbytes/sec max)
16.6 (PIO mode 4)
100 (Ultra DMA mode 5)
Interleave
1:1
Cache buffer
2 Mbytes
Drive Specification
ST330631A, ST320424A,
ST315324A, ST310216A
Maximum height (mm)
(inches)
26.1
1.028
Maximum width
(mm)
(inches)
101.8
4.020
Maximum length (mm)
(inches)
147.0
5.78
Typical weight
(grams)
(pounds)
544
1.2
