A flat VMDK from an older VM hardware version (e.g., v7) may not boot correctly on a newer version (v19) without proper SCSI controller or firmware (BIOS vs. UEFI) adjustments.
Beyond the Snapshot: The Mechanics and Strategic Value of Flat VMDK Restore flat vmdk restore
Geometry can be calculated: total sectors = size in bytes / 512. A flat VMDK from an older VM hardware version (e