Flatten VMDKs in order to use for preseed
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Preseed VMDKs are required to be flat VMDKs, not delta VMDKs, or VMDKs from a VCD vApp created from a catalog.
In order to flatten VMDK delta disks, from within the vSphere client - attach the disks to any VM, right click on the VM in inventory, then click on Snapshot -> Consolidate. This will create a VMDK that includes “-flat” in the filename. This disk can then be used for pre-seeding in Zerto.