Lets break down a part number to easily understand
WUH721414AL4205
WU = Western Digital Ultrastar
H= Helim ( S = Standard) All the drives from 1 to 8 tb ( and new 10TB AIR) have S. 12,14 TB have H to denote helium platform
72= 7200 RPM
1414 = 14TB full capacity , 14TB capacity of this model. ( 1412 would mean 14 full capacity and 12tb capacity of this model)
AL = generation, height
42= interface. (52 = 512e SAS, E6= 512e SATA, N6= 4kn SATA, 42 = 4Kn SAS)
0 = power Diable
5 = Encryption ( 1 = TCG, 4 = Secure Erase, 5 = TCG/FIPS)