Product Data Sheet

2879–810058-A03 September 2020
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Specifications
SATA Models SAS Models
Model Numbers
WUH721818ALE6L1
WUH721818ALE6L4
WUH721816ALE6L1
WUH721816ALE6L4
WUH721818AL5200
WUH721818AL5201
WUH721818AL5204
WUH721818AL5205
WUH721816AL5201
WUH721816AL5204
WUH721816AL5205
Configuration
Interface SATA 6Gb/s SAS 12Gb/s
Capacity
1
18/16TB
←
Format: Sector size (bytes) 4Kn: 4096
512e: 512
4Kn: 4096, 4160, 4224
512e: 512, 520, 528
Areal Density (Gbits/sq. in, max) 1022 (18TB), 918 (16TB)
←
Performance
Data buffer
4
(MB) 512
←
Rotational speed (RPM) 7200
←
Latency average (ms) 4.16
←
Interface transfer rate (MB/s, max) 600 1200
Sustained transfer rate
5
(MB/s, max) / (MiB/s, max)
269/257 (18TB)
262/250 (16TB)
←
Reliability
Error rate (non-recoverable bits read) 1 in 10
15
←
Load/Unload cycles (at 40°C) 600,000
←
Availability (hrs/day x days/wk) 24×7
←
MTBF
2
(M hours, projected) 2.5
←
Annualized Failure Rate
2
(AFR, projected)
0.35%
←
Workloads Up to 550 TB/year
←
Limited warranty (yrs) 5
←
Example: WUH721818ALE6L4 = 7200 RPM, 18TB, 512e SATA 6Gb/s, Base(SE)
W = Western Digital
U = Ultrastar
H = Helium (vs. S for Standard)
72 = 7200 RPM
18 = Full capacity (18TB)
18 = Capacity this model (18TB)
A = Generation code
L = 26.1 z-height
E6 = Interface (512e SATA 6Gb/s)
(52 = 512e SAS 12Gb/s)
y = Power Disable Pin 3 status
(0 = Power Disable Pin 3 support
L = Legacy Pin 3 config – No Power
Disable Support)
z = Data Security Mode
0 = Instant Secure Erase
1 = SED*: Self Encrypting Drive
TCG-Enterprise and Sanitize
Crypto Scramble / Erase
4 = Base (SE)*: No Encryption. Sanitize
Overwrite only.
5 = SED-FIPS: SED w/ certification
* ATA Security Feature Set comes
standard on SATA
How to Read Model Number
DATA SHE E T 3.5-INCH HELIUM PLATFORM ENTERPRISE HARD DRIVES
Ultrastar
®
DC HC550
 One MB is equal to one million bytes, one
GB is equal to one billion bytes and one TB
equals 1,000GB (one trillion bytes). Actual
user capacity may be less due to operating
environment.
 Projected values. Final MTBF and AFR
specifications will be based on a sample
population and are estimated by statistical
measurements and acceleration algorithms
under typical operating conditions,
workload 220TB/year and temperature
40C. Derating of MTBF and AFR will occur
above these parameters, up to 550TB writes
per year and 60°C ambient (65°C device
temp). MTBF and AFR ratings do not predict
an individual drive’s reliability and do not
constitute a warranty.
 Advanced Format drive: 4K (4096-byte)
physical sectors.
 Portion of buffer capacity used for drive
firmware
 Based on internal testing; performance may
vary depending on host environment, drive
capacity and other factors. 1MiB = 1,048,576
bytes (2
20
), 1MB = 1,000,000 bytes (10
6
)
 SATA models:
Random RW 50/50 8KB QD=1 @40 IOPS,
SAS models:
Random RW 50/50 4KB QD=4 @MAX IOPS
7
Idle specification is based on use of Idle_A
SATA Models SAS Models
Acoustics
Idle/Operating (Bels, typical) 2.0/3.6
←
Power
Requirement +5 VDC, +12VDC
←
Operating
6
(W) 6.5 8.8
Idle
7
(W) 5.6 5.8
Power consumption efficiency at idle (W/TB)
18TB
16TB
0.31
0.35
0.32
0.36
Physical Size
z-height (mm) 26.1
←
Dimensions (width x depth, mm) 101.6 (+/-0.25) x 147
←
Weight (g, max) 690
←
Environmental (Operating)
Ambient temperature 5° to 60°C
←
Shock (half-sine wave, 2ms, G) 50
←
Vibration (G RMS, 5 to 500Hz) 0.67 (XYZ)
←
Environmental (Non-operating)
Ambient temperature -40° to 70°C
←
Shock (half-sine wave, 2ms, G) 250 (2ms)
←
Vibration (G RMS, 2 to 200Hz) 1.04 (XYZ)
←
* See How to Read Model Number for possible values for z.