Seagate ST980811AS manual Physical organization, Recording and interface technology, Drive model

2.4Physical organization

Drive model	Read/write heads	Number of discs
ST9160821AS	4	2
ST9120822AS	3	2
ST9100828AS	3	2
ST980811AS	2	1
ST960813AS	2	1
ST940814AS	1	1

2.5Recording and interface technology

Interface	Serial ATA (SATA)
Recording method	Perpendicular
Recording density BPI (bits/inch max)	870k
Track density TPI (tracks/inch max)	150k
Areal density (Gbits/inch2 max)	132
Spindle speed (RPM) (± 0.2%)	5,400
Maximum Internal transfer rate (Mbits/sec)	352
I/O data-transfer rate (Mbytes/sec max)	150
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)	100.50 +/-0.25
	(inches)	3.957	+/-0.010
Typical weight
	ST9160821AS	100 grams
	ST9120822AS	0.22 pounds
	ST9100828AS
	ST980811AS	96 grams
	ST960813AS	0.21 pounds
	ST940814AS

6 Momentus 5400.3 SATA Product Manual, Rev. D