Western Digital WD Ultrastar Enterprise HDD 18TB
3.5" SATA 512MB 7200RPM 512E SE NP3 DC HC550 24x7 Server 2.5mil hrs MTBF
WUH721818ALE6L4
Industry’s first Energy-Assisted Magnetic Recording
technology
Industry’s first Triple Stage Actuator
Leading HelioSeal technology
Reliable, field-proven design across five generations
HelioSeal design delivers power efficiency (Watts/TB)
2.5M hours MTBF rating
Specifications:
|
Interface
|
SATA 6 Gb/s
|
|
Capacity1
|
18TB
|
|
Format:
Sector size (bytes)2
|
4Kn: 4096
512e: 512
|
|
Data buffer
(MB)3
|
512
|
|
Rotational
speed (RPM)
|
7200
|
|
Sustained
transfer rate
(MiB/s,
typical)
(MB/s,
typical)
|
257
269
|
|
Error rate
(non-recoverable bits read)
|
1 in 1015
|
|
MTBF (M
hours)4
|
2.5
|
|
Annualized
Failure Rate (AFR)
|
0.35%
|
|
Load/Unload
cycles (at 40°C)
|
600,000
|
|
Availability
(hrs/day x days/wk)
|
24x7
|
|
Idle/Operating
(Bels, typical)
|
2.0/3.6
|
|
Power Requirement
|
+5 VDC,
+12VDC
|
|
Operating (W)
|
6.5
|
|
Idle (W)6
|
5.6
|
|
z-height (mm)
|
26.1
|
|
Dimensions
(width x depth, mm)
|
101.6
(+/-0.25) x 147
|
|
Weight (g,
max)
|
690
|
|
Environmental
(Operating)
|
|
|
Ambient
temperature
|
50C
to 600C
|
|
Shock
(half-sine wave, 2ms, G)
|
70
|
|
Vibration-Operating
(G RMS, 5 to 500 Hz)
|
|
|
Environmental
(Non-Operating)
|
|
|
Ambient
temperature
|
-400C
to 700C
|
|
Shock
(half-sine wave, G)
|
300 (2 ms)/
150 (11ms)
|
|
Random
Vibration (G RMS, 2 to 200 Hz)
|
1.04 (XYZ)
|
Disclosures
1. One megabyte (MB) is equal to one million bytes, one
gigabyte (GB) is equal to 1,000MB (one billion bytes), and one terabyte (TB) is
equal to 1,000GB (one trillion bytes) when referring to storage capacity.
Accessible capacity will vary from the stated capacity due to formatting,
system software, and other factors.
2. Advanced Format drive: 4K (4096-byte) physical sectors.
3. Portion of buffer capacity used for drive firmware.
4. MTBF and AFR targets are based on a sample population and
are estimated by statistical measurements and acceleration algorithms under
median operating conditions. MTBF and AFR ratings do not predict an individual
drive’s reliability and do not constitute a warranty.
5. SATA models: 8K Queue Depth = 1 @ 40 IOPS, SAS models: 4K
Queue Depth = 4 @ Max IOPS.
6. Idle specification is based on use of Idle_A. |
