Seagate ST9500323CS manual Physical organization, Recording and interface technology, Seek time

2.4Physical organization

Drive model	Read/write heads	Number of discs
ST9500323CS	4	2
ST9320328CS	3
ST9250311CS	2	1
ST91603110CS

2.5Recording and interface technology

Interface	Serial ATA (SATA)
Recording method	Perpendicular
Recording density BPI (bits/inch avg)	1,490k
Track density TPI (tracks/inch avg)	265k
Areal density (Gbits/inch2 avg)	394
Spindle speed (RPM) (± 0.2%)	5,400
Maximum Internal transfer rate (Mbits/sec)	1,175
I/O data-transfer rate (Mbytes/sec max)	300 default / 150 available via Seagate specific SCT command
Interleave	1:1
Cache buffer	8 Mbytes (8,192 kbytes)

2.6Physical characteristics

Drive specification
Height	(mm)	9.5 +/-0.2
	(inches)	0.374	+/-0.0078
Width	(mm)	69.85	+/-0.25
	(inches)	2.75 +/-0.0098
Length	(mm)	100.35 +0.55 / -0.25
	(inches)	3.957	+0.079 / -0.0098
Weight (max)		110 grams
ST9500323CS, ST9320328CS,		0.243 pounds
ST9250311CS, ST91603110CS

2.7Seek 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 ran- dom tracks, less overhead.

Table 2: Typical seek times

Seek times (msec)

Read

6 Pipeline HD Mini Series SATA Product Manual, Rev. E