GibiBytes is a unit of data. One GiB is approximately 1.074 GB. [One gibibyte is equal to 1073741824bytes = 1024 mebibytes]. Azure virtual disk sizes are measured in Gibibytes (GiB), which are not the same as Gigabytes (GB). Therefore, to obtain an approximate equivalent of your virtual disk size in GB, multiply the size in GiB by 1.074, and that will return a size in GB. For example, 32,767 GiB would be approximately 35,183 GB.
Whereas a Gigabyte is an another unit of data storage capacity, is approximately 1024 Mega Bytes (MB). Normal storage disks uses Gigabyte (GB) terminology to represent the storage capacity.