sourceDisk property

URL of the source disk used to create this instant snapshot.

Note that the source disk must be in the same zone/region as the instant snapshot to be created. This can be a full or valid partial URL. For example, the following are valid values: - https://www.googleapis.com/compute/v1/projects/project/zones/zone /disks/disk - https://www.googleapis.com/compute/v1/projects/project/regions/region /disks/disk - projects/project/zones/zone/disks/disk - projects/project/regions/region/disks/disk - zones/zone/disks/disk - regions/region/disks/disk