Step 4. Select Mount Mode
At the Mount Mode step of the wizard, select the First class disk (FCD) option to register virtual disks on a cluster as FCDs.
If you want to register virtual disks on VM added to an ESXi host, select the VM disks option. In this case, Veeam Backup & Replication will perform the instant disks recovery as it is documented in the Performing Instant VM Disk Recovery section.