Hi @TarekAHF ,
if the "physically size" of the disk (1024 GB) differs from the partition size (126 GB) please take a look in the Disk Management of the VM.
It might be there is "unused/unallocated" disk space on the volume.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten