Recovery involves recreating this descriptor file to match your existing data file. Step 1: Identify Critical File Details
vmkfstools -c -a -d thin temp.vmdk
# Disk DescriptorFile version=1 CID=fffffffe parentCID=ffffffff createType="vmfs"
When you have only the -flat.vmdk file (the raw data file) but the associated descriptor .vmdk file is missing or corrupted, you can manually recreate the VM.
Once the file is saved, VMware should recognize the disk again.
Before touching the data, you must understand why the flat file alone is problematic.