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NL35 Series SATA Product Manual, Rev. B
7
2.4 Recording and interface technology
2.5 Physical characteristics
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.
*Measured in quiet mode
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) 763,000
Track density TPI (tracks/inch avg) 120,000
Areal density (Mbits/inch
2
avg) 91,560
Spindle speed (RPM) (± 0.2%) 7,200
Internal data transfer rate (Mbytes/sec max) 95
Sustained transfer rate OD (Mbytes/sec max) 65
I/O data-transfer rate (Mbytes/sec max) 150 (SATA 1.0)
Interleave 1:1
Cache buffer 8 Mbytes (8,192 kbytes) on ST3400832NS and
ST3250823NS models.
16 Mbytes (16,384) on ST3400632NS and
ST3250623NS models.
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)
635
1.39
*Typical seek times (msec) Read Write
Track-to-track 0.8 1.0
Average 8.0 9.0
Average latency: 4.16 4.16