Datasheet
Barracuda SATA Product Manual, Rev. A 11
2.0 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:
2.1 Specification summary tables
The specifications listed in the following tables are for quick reference. For details on specification measurement
or definition, see the appropriate section of this manual.
ST500DM002 ST320DM000 ST250DM000
Table 1 Drive specifications summary for 500, 320 and 250GB models
Drive Specification ST500DM002 ST320DM000 ST250DM000
Formatted capacity* 500GB 320GB 250GB
Guaranteed sectors 976,773,168 625,142,448 488,397,168
Heads 2 2 1
Disks 1 1 1
Bytes per sector 4096 4096 4096
Default sectors per track 63 63 63
Default read/write heads 16 16 16
Default cylinders 16,383 16,383 16,383
Recording density (max.) 1413kb/in 1413kb/in 1413kb/in
Track density (avg.) 236 ktracks/in 236 ktracks/in 236 ktracks/in
Areal density (avg.) 329Gb/in
2
329Gb/in
2
329Gb/in
2
Spindle speed 7200 RPM 7200 RPM 7200 RPM
Internal data transfer rate (max) 1695Mb/s 1695Mb/s 1695Mb/s
Sustained data transfer rate OD
(max)
125MB/s 125MB/s 125MB/s
I/O data-transfer rate (max.) 600MB/s 600MB/s 600MB/s
ATA data-transfer modes sup-
ported
PIO modes: 0 to 4
Multiword DMA modes: 0 to 2
Ultra DMA modes: 0 to 6
PIO modes: 0 to 4
Multiword DMA modes: 0 to 2
Ultra DMA modes: 0 to 6
PIO modes: 0 to 4
Multiword DMA modes: 0 to 2
Ultra DMA modes: 0 to 6
Cache buffer 16MB 16MB 16MB
Height (max) 19.98mm / 0.787 in 19.98mm / 0.787 in 19.98mm / 0.787 in
Width (max) 101.6mm / 4.0 in (
+ 0.010 in) 101.6mm / 4.0 in (+ 0.010 in) 101.6mm / 4.0 in ( + 0.010 in)
Length (max) 146.99mm / 5.787 in 146.99mm / 5.787 in 146.99mm / 5.787 in
Weight (typical) 415g / 0.915 lb 415g / 0.915 lb 415g / 0.915 lb
Average latency 4.16ms 4.16ms 4.16ms
Power-on to ready (max) <8.5s <8.5s <8.5s
Standby to ready (max) <8.5s <8.5s <8.5s
Track-to-track seek time (typical)
<1.0ms read;
<1.2ms write
<1.0ms read;
<1.2ms write
<1.0ms (read)
<1.2ms (write)
Average seek, read (typical)
<8.5ms (read)
<8.5ms (read) <8.5ms (read)
Average seek, write (typical) <9.5ms (write) <9.5ms (write) <9.5ms (write)