The mode in which to attach this disk. If not specified, the default is READ_WRITE mode. Only applicable to dataDisks. Default value is READ_WRITE. Possible values are: READ_WRITE, READ_ONLY.
READ_WRITE
READ_ONLY
Specifies the full path to an existing disk. For example: "projects/my-project/zones/us-central1-c/disks/my-disk".