Formatted Capacity; Lba Mode; Default Logical Geometry; Recording And Interface Technology - Seagate CONSTELLATION.2 ST91000640NS Product Manual

3.2

Formatted capacity

Formatted
Model capacity*
ST91000640NS
ST91000641NS 1000 GB
ST91000642NS
ST9500620NS
ST9500621NS 500 GB
ST9500622NS
ST9250610NS
ST9250611NS 250 GB
ST9250612NS
*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
3.2.1

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.
See Section 7.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-
bit addressing support of drives with capacities over 137 Gbytes.
3.3

Default logical geometry

Cylinders Read/write heads
16,383 16
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.
3.4

Recording and interface technology

Interface
Recording method
Recording density, KBPI (Kb/in max)
Track density, KTPI (Ktracks/in avg)
2
Areal density (Gb/in avg)
Spindle speed (RPM) (± 0.2%)
Internal data transfer rate (Mb/s max)
Sustained data transfer rate (MB/s max)
I/O data-transfer rate (MB/s max)
Constellation.2 Serial ATA Product Manual, Rev. B
Guaranteed
sectors
1,953,525,168
976,773,168
488,397,168
Sectors per track
63
All models
Serial ATA (SATA)
Perpendicular
1544
270
417
7200
1304
115
600
Bytes per sector
512
7