Seagate ST3250623NS manual Recording and interface technology, Physical characteristics, Seek time

2.4Recording and interface technology

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/inch2 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.

2.5Physical characteristics

Maximum height
(mm)	26.11
(inches)	1.028
Maximum width
(mm)	101.85
(inches)	4.010
Maximum length
(mm)	146.99
(inches)	5.787
Maximum weight
(grams)	635
(pounds)	1.39

2.6Seek 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 (msec)	Read	Write
Track-to-track	0.8	1.0
Average	8.0	9.0
Average latency:	4.16	4.16

*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

NL35 Series SATA Product Manual, Rev. B 7