In VMware virtualization environments, a Virtual Machine Disk (VMDK) file serves as the storage backbone for guest operating systems. A VMDK typically consists of two parts: a small text descriptor file ( .vmdk ) and a larger data file ( .vmdk ). In older or "thick provisioned" configurations, this data file is often referred to as a (usually denoted as -flat.vmdk ).
: Run vmkfstools -c [size] -d thin temp.vmdk using the exact size found in step 1. This creates a "dummy" descriptor and flat file.
For advanced users with SSH access to the ESXi host, vmkfstools is the primary utility for disk management. flat vmdk recovery
: A small text file (usually a few KB) containing the disk’s geometry, adapter type, and a pointer to the flat file.
| Tool | Purpose | License | |------|---------|---------| | | Native ESXi CLI recovery | Free (VMware) | | DiskInternals VMFS Recovery | Flat file extraction | Commercial | | R-Studio for Linux | Raw disk analysis | Commercial | | UFS Explorer | Cross-platform VMDK repair | Commercial | | TestDisk | Partition table recovery | Open Source | : Run vmkfstools -c [size] -d thin temp
The most common way to recover a flat VMDK is to recreate its missing descriptor file. This allows VMware to "see" the data again.
If the -flat file is intact, you only need to rebuild its pointer. : A small text file (usually a few
If the -flat.vmdk exists but the .vmdk descriptor is missing, the virtual machine will fail to power on. You can manually reconstruct the descriptor using the ESXi command line. Difference between .vmdk and -flat.vmdk | VMware vSphere
To effectively recover a flat VMDK, one must understand its structure.
