Seagate ST94811AB Formatted capacity, Default logical geometry, Physical organization, LBA mode

2.2	Formatted capacity
Model		Formatted capacity	Guaranteed sectors	Bytes per sector
ST94811AB		40 Gbytes	78,140,160	512
2.3	Default logical geometry
Cylinders		Read/write heads	Sectors per track
16,383		16	63

LBA mode

When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,where n is the number of guaranteed sectors as defined above.

2.4Physical organization

Model	Read/write heads	Number of discs
ST94811AB	2	1

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%)	5,400
Internal data transfer rate OD (Mbytes/sec max)	48.25
Sustained data transfer rate OD (Mbytes/sec max)	34.5
I/O data transfer rate (Mbytes/sec max)	100 (Ultra DMA mode 5)
Interleave	1:1
Cache buffer
ST94811AB	8 Mbytes (8,192 kbytes)

Momentus Blade Server Product Manual, Rev. B 5