Seagate ST980825AS manual Physical organization, Recording and interface technology, Drive model

2.4Physical organization

Drive model	Read/write heads	Number of discs
ST910021AS	4	2
ST980825AS	4	2
ST96023AS	3	2
ST94015AS	2	1

2.5Recording and interface technology

Interface	Serial ATA (SATA)
Recording method	16/17 EPRML
Recording density BPI (bits/inch max)	700,000
Track density TPI (tracks/inch max)	114,000
Areal density (Mbits/inch2 max)	81
Spindle speed (RPM) (± 0.2%)	7,200
Maximum Internal transfer rate (Mbits/sec)	539
Sustained transfer rate OD (Mbytes/sec max)	45.8
I/O data-transfer rate (Mbytes/sec max)	150 (SATA 1.0)
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)	100.5+/-1.6
	(inches)	3.957	+/- 0.063
Typical weight	(grams)	115 grams
	(pounds)	(0.254 lb)

6 Momentus 7200.1 SATA Product Manual, Rev. B