Seagate ST940110A manual Recording and interface technology, Physical characteristics, Seek time

2.5Recording and interface technology

Technology	Specification
Interface	Parallel ATA
Recording method	RLL 0,11
Recording density BPI (bits/inch max)	642,000
Track density TPI (tracks/inch max)	100,780
Areal density (Mbits/inch2 max)	65
Spindle speed (RPM) (± 0.2%)	4,200 class performance (spin speed actually 5,400 RPM)
Internal data-transfer rate OD (Mbytes/sec max)	48.25
Sustained data transfer rate OD (Mbytes/sec max)	31.0
I/O data-transfer rate (Mbytes/sec max)	100 (Ultra DMA mode 5)
Interleave	1:1
Cache buffer	2 Mbytes (2,048 kbytes)

2.6Physical characteristics

Height	(mm)	9.5 +/-0.2
	(inches)	0.374	+/-0.0078
Width	(mm)	69.85	+/-0.25
	(inches)	2.75	+/-0.0098
Length	(mm)	100.2	+/-0.25
	(inches)	3.945	+/-0.0098
Typical weight	(grams)	99
	(pounds)	0.218

2.7Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications 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	1.5	2.0
Average	12.0	14.0
Full-stroke	22.0	26.0
Average latency	5.6	5.6

*Measured in performance 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 or exceed the noted values.

6 Momentus 4200 N-Lite Product Manual, Rev. A