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4 Momentus XT Product Manual, Rev. D
3.0 Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal
power.
3.1 Specification summary table
The specifications listed in this table are for quick reference. For details on specification measurement or defi-
nition, see the appropriate section of this manual.
Table 1: Drive specifications
Drive specification ST750LX003 ST500LX003
Formatted GB (512 bytes/sector)* 750 500
Guaranteed sectors 1,465,149,168 976,773,168
Bytes per sector 4K emulation @ 512
Physical read/write heads 4
Discs 2
Cache (MB) 32
Recording density in BPI (bits/in max) 1778k
Track density TPI (tracks/in max) 317k
Areal density (Gb/in
2
max) 563.6
Spindle speed (RPM) 7200
Average latency (ms) 4.20
Internal transfer rate (Gb/s max) 1.23
I/O data transfer rate (Gb/s max) 6.0
ATA data-transfer modes supported SATA 1.0, Serial ATA Revision 2.6
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Height (max) 9.5 ± 0.2 mm (0.370 ± .008 in)
Width (max) 69.85 ± 0.25 mm (2.750 ± 0.010 in)
Length (max) 100.30 ± 0.25 mm (3.949 ± 0.010 in)
Weight (max) 115 g (0.253 lb)
Power-on to ready (sec typical) 5.0
Standby to ready (sec typical) 3.5
Track-to-track seek time, read (msec typical) 1.5
Average seek, read (ms typical) 11.0
Average seek, write (ms typical) 13.0
Startup current, +5V amps (max) 1.2
Read power (watts typical) 3.3