If a delta file is accidentally deleted, the snapshot chain breaks. This renders the entire virtual machine (VM) unbootable or causes it to roll back to an outdated state. Why Delta VMDK Chains Fail
: Specialized software like Diskinternals VMFS Recovery or UFS Explorer can scan the raw blocks of an ESXi LUN. They can often find "orphaned" delta files and attempt to reconstruct the directory tree. delta vmdk recovery
A delta VMDK consists of:
: Map the VMDK as a drive on a Windows host or attach it as an "existing hard disk" to another VM to extract specific files. 3.3 Advanced Hex Editing and Repair When metadata structures within the delta file itself are corrupt, specialized tools like DiskInternals VMFS Recovery or SysTools VMware Recovery are used to scan for "Grains" (blocks of data) and reconstruct the file system. 4. Best Practices for Prevention Avoid Long Snapshot Chains If a delta file is accidentally deleted, the
The most common failure mode is a broken chain, where the VM cannot find the parent disk or the CID check fails. They can often find "orphaned" delta files and
If parent is lost, reconstruct data using: