Desktop SSHD Product Manual, Rev. B 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 Table 1 are for quick reference. For details on specification measurement or definition,
refer to the appropriate section of this manual.
ST4000DX001 ST2000DX001 ST1000DX001
Table 1 Drive specifications summary for 4TB, 2TB and 1TB models
Drive Specification* ST4000DX001 ST2000DX001 ST1000DX001
Formatted capacity (512 bytes/sector)** 4000GB (4TB) 2000GB (2TB) 1000GB (1TB)
Guaranteed sectors 7,814,037,168 3,907,029,168 1,953,525,168
Heads 8 4 2
Disks 4 2 1
NAND flash Commercial Multilevel Cell
(cMLC)/size
cMLC/8GB cMLC/8GB cMLC/8GB
Bytes per sector (4K physical emulated at
512-byte sectors)
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) 1807kFCI 1807kFCI 1807kFCI
Track density (avg) 340ktracks/in 352ktracks/in 352ktracks/in
Areal density (avg) 625Gb/in
2
625Gb/in
2
625Gb/in
2
Spindle speed 5900 RPM 7200 RPM 7200 RPM
Internal data transfer rate (max) 1813Mb/s 2147Mb/s 2147Mb/s
Average data rate, read/write (MB/s) 146MB/s 156MB/s 156MB/s
Maximum sustained data rate, OD read
(MB/s)
180MB/s 210MB/s 210MB/s
I/O data-transfer rate (max) 600MB/s 600MB/s 600MB/s
Cache buffer 64MB 64MB 64MB
Height (max) 26.1mm / 1.028 in 26.1mm / 1.028 in 20.17mm / 0.7825 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) 610g / 1.345 lb 535g / 1.18 lb 400g / 0.88 lb
Average latency 5.1ms 4.16ms 4.16ms
Power-on to ready (max)
‡
<1.0s <1.0s <1.0s
Standby to ready (max)
‡
<1.0s <1.0s <1.0s
Average seek, read (typical)
Average seek, write (typical)
<12.0ms typical
<12.0ms typical
<8.5ms (read)
<9.5ms (write)
<8.5ms (read)
<9.5ms (write)
Startup current 12V 2.0A 2.0A 2.0A
