You can obtain the info with wit and without a hex editor:
CODE# wit dump --show intro pool/wdf/mkw.wdf
Dump of file pool/wdf/mkw.wdf
ÂÂReal path:ÂÂÂÂÂÂÂÂ .../mkw.wdf
ÂÂVirtual size:ÂÂÂÂÂÂ118240000/hex = 4699979776 = 4482 MiB
ÂÂScrubbed size:ÂÂÂÂÂÂb20c0000/hex = 2987130880 = 2849 MiB, 63.6%
ÂÂWDF file size:ÂÂÂÂÂÂb2e054a0/hex = 3001046176 = 2862 MiB, 63.9%, 100.5%
ÂÂFile & disc type:ÂÂWDF/WIIÂÂ&ÂÂWii
ÂÂDisc & part IDs:ÂÂ disc=RMCP01, ticket=RMCP, tmd=RMCP, boot=RMCP01ÂÂ