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NL35 Series 7200.2 SATA Product Manual, Rev. C
2.3 Recording and interface technology
2.4 Physical characteristics
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.
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.
Interface Serial ATA (SATA)
Recording method 16/17 EPRML
Recording density BPI (bits/inch max) 790.7k
Track density TPI (tracks/inch avg) 134.4k
Areal density (Gbits/inch
2
avg) 106.35
Spindle speed (RPM) (± 0.2%) 7,200
Internal data transfer rate (Mbits/sec max) 754
Sustained transfer rate (Mbytes/sec) 65
I/O data-transfer rate (Mbytes/sec max) 300
Interleave 1:1
Cache buffer 8 Mbytes (8,192 kbytes) on ST3500841NS drives
16 Mbytes (16,384 kbytes) on ST3500641NS drives.
Maximum height
(mm)
(inches)
26.11
1.028
Maximum width
(mm)
(inches)
101.85
4.010
Maximum length
(mm)
(inches)
146.99
5.787
Maximum weight
(grams)
(pounds)
710
1.57
Typical seek times (msec) Read Write
Track-to-track 0.8 1.0
Average 8.0 9.0
Average latency: 4.16 4.16