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4 Constellation ES Serial ATA Product Manual, Rev. G
3.0 Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal
power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate the
following drive models:
3.1 Specification summary tables
The specifications listed in the following tables are for quick reference. For details on specification measure-
ment or definition, see the appropriate section of this manual.
Table 1: Drive specifications summary
ST32000644NS ST31000524NS ST3500514NS
Drive specification ST32000644NS ST31000524NS ST3500514NS
Formatted (512 bytes/sector)* 2TB 1TB 500GB
Guaranteed sectors 3,907,029,168 1,953,525,168 976,773,168
Heads 8 4 2
Discs 4 2 1
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density, KBPI (Kb/in max) 1421
Track density, KTPI (ktracks/in avg.) 240
Areal density, (Gb/in
2
avg) 347
Spindle speed (RPM) 7200
Internal data transfer rate
(Mb/s max)
1300
Sustained data transfer rate OD
(MB/s max)
140
I/O data-transfer rate
(MB/s max)
300
ATA data-transfer modes supported PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Cache buffer 64MB 32MB
Weight: (maximum) 710g (1.565 lb) 640g (1.411 lb) 610g (1.345 lb)
Average latency 4.16ms
Power-on to ready (sec max) 15 10 7
Standby to ready (sec max) 15 10 7