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NL35.2 Series SATA Product Manual, Rev. A
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
Interface Serial ATA (SATA)
Recording method 16/17 EPRML
Recording density BPI (bits/inch max) 790.1k
Track density TPI (tracks/inch avg) 124.5k
Areal density (Gbits/inch
2
avg) 97.69
Spindle speed (RPM) (± 0.2%) 7,200
Internal data transfer rate (Mbits/sec max) 815.2 (ST3400833NS and ST3400633NS)
867.2 (ST3250824NS and ST3250624NS)
Sustained transfer rate (Mbytes/sec) 65 (ST3400833NS and ST3400633NS)
76.6 (ST3250824NS and ST3250624NS)
I/O data-transfer rate (Mbytes/sec max) 300
Interleave 1:1
Cache buffer ST3400633NS and ST3250624NS: 16 Mbytes (16,384 kbytes)
ST3400833NS and ST3250824NS: 8 Mbytes (8,192 kbytes)
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
ST3400833NS and ST3400633NS
ST3250824NS and ST3250624NS
<8.2
<8.0
<9.0
<8.0
Average latency: 4.16 4.16