WD Ultrastar DC HC550

Model:

WUH721818ALE6L1
WUH721818ALE6L4
WUH721816ALE6L1
WUH721816ALE6L4

How to Read Model Numbers

WUH721818ALE6L4 – 18TB SATA 6Gb/s 512e Base (SE) with Legacy Pin 3 config
W = Western Digital
U = Ultrastar
H = Helium
72 = 7200 RPM
18 = Max capacity (18TB)
18 = Capacity this model (18TB)
A = Generation code
L = 26.1mm z-height
E6 = Interface (512e SATA 6Gb/s)
(52 = 512e SAS 12Gb/s)
** 512e models can be converted to 4Kn format and vice versa
(Note: Changing the block size does not change the HDD Model Number reported by the drive.)
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
1 = SED: Self-Encryption Drive
TCG-Enterprise and Sanitize Crypto Scramble / Erase
4 = Base (SE): No Encryption, Sanitize Overwrite only
5 = SED-FIPS: SED w/ certification (SAS only)
* ATA Security Feature Set comes standard on SATA
** See section 12.51 Set Sector Configuration Ext
One TB equals one trillion bytes.
Actual user capacity may be less due to operating environment.