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Momentus 5400.4 SATA Product Manual, Rev. B (Draft 02)
2.4 Physical organization
2.5 Recording and interface technology
2.6 Physical characteristics
Drive model Read/write heads Number of discs
ST9250827AS 4 2
ST9200827AS 4 2
ST9160827AS 3 2
ST9120817AS 2 1
Interface Serial ATA (SATA)
Recording method Perpendicular
Recording density BPI (bits/inch max) 1,180k
Track density TPI (tracks/inch max) 173k
Areal density (Gbits/inch
2
max) 204
Spindle speed (RPM) (± 0.2%) 5,400
Internal transfer rate (Mbits/sec, max) 778
Sustained transfer rate (Mbytes/sec, max) 58
I/O data-transfer rate (Mbytes/sec max) 300
Interleave 1:1
Cache buffer 8 Mbytes (8,192 kbytes)
Drive specification
Height (mm)
(inches)
9.5 +/-0.2
0.374 +/-0.0078
Width (mm)
(inches)
69.85 +/-0.25
2.75 +/-0.0098
Length (mm)
(inches)
100.20 +/-0.25
3.945 +/-0.010
Typical weight
ST9250827AS
ST9200827AS
ST9160827AS
ST9120817AS
102 grams
0.23 pounds
97 grams
0.21 pounds