A deleted or corrupted VMDK file can bring everything to a standstill—jeopardizing your applications, services, and even business operations. VMDK (Virtual Machine Disk) files store the entire contents of a virtual machine’s disk. This includes the operating system, installed software, and all user-generated data. Losing or damaging this file can mean a total VM failure.
This article walks you through practical, tested methods for recovering VMDK files—whether they’ve been deleted accidentally or corrupted due to power failure, file system damage, or storage issues.
What Is a VMDK File?
A VMDK file (Virtual Machine Disk) is the core component of a VMware virtual machine. It represents the VM’s hard disk and holds all the system and user data.
VMware uses two main files for a virtual disk:
- Descriptor file (.vmdk): A small text file that defines disk metadata, geometry, and references the actual data file.
- Flat file (flat.vmdk): The raw data of the virtual disk. It stores the OS, applications, and all data inside the VM.
Losing either file can prevent a VM from booting. However, if the flat file is intact, recovery may still be possible.
Common Scenarios for VMDK Loss or Corruption
VMDK files can become inaccessible or lost due to:
- Accidental Deletion: Removing the VM or VMDK file without backup.
- File System Corruption: Errors in VMFS (for ESXi) or NTFS/EXT4 can corrupt the disk.
- Power Failures or Host Crashes: Interruptions during disk writes can damage the file.
- Improper Snapshot Handling: Failed snapshot merges or misuse of delta disks.
- Malware or Ransomware Attacks: Encryption or deletion of VMDK files.
- Storage Failure: Hardware-level issues in RAID/NAS/SAN setups.
Can You Recover a Deleted or Corrupted VMDK?
Yes, it is possible to recover a deleted or corrupted VMDK file—but the success rate depends heavily on several factors. If the file was soft-deleted (i.e., removed but not yet overwritten), data recovery tools have a good chance of retrieving it. The condition of the storage medium also plays a significant role; a healthy disk without bad sectors offers a better environment for recovery. Having a backup—whether from vSphere, Veeam, or another solution—makes the process much easier, allowing you to restore the virtual disk or entire VM with minimal downtime. Additionally, the presence of the descriptor .vmdk file can make recovery more straightforward, though even if it’s missing, you can often recreate it manually if the flat file still exists.
Recovery is especially likely when the flat file (which contains the actual disk data) is intact, even if the descriptor is lost. Similarly, if the VMDK file was only recently deleted and hasn’t been overwritten by new data, tools like DiskInternals VMFS Recovery or R-Studio may be able to recover it completely. In cases of corruption, as long as significant portions of the file remain readable, specialized utilities can extract usable data or reconstruct the virtual disk. Time is critical—once you suspect deletion or corruption, halt all write operations on the affected storage to maximize your chances of successful recovery.
Recovery Methods
Recover from Backup (Preferred Method)
If you’ve used a backup tool like vSphere, Veeam, or Nakivo:
- Locate the VM or VMDK backup.
- Restore the entire VM or only the virtual disk.
- Reattach the restored VMDK to a VM.
Recover Deleted VMDK with Data Recovery Tools
If no backup is available, try VMDK recovery software:
Recommended Tools:
- DiskInternals VMFS Recovery – Excellent for recover vmdk file
- R-Studio – Broad file system support (NTFS, Ext4, RAID).
- EaseUS Data Recovery – Suitable for Windows-based VMDK locations.
How to Use These Tools:
- Connect the storage disk to a recovery system.
- Run a deep scan for deleted or lost VMDK files.
- Filter results by extension (.vmdk, .flat.vmdk).
- Preview (if supported) and save the recovered file to a different drive.
Repair Corrupted VMDK File
If the file is present but won’t open or mount, attempt repair:
Option 1: VMware Workstation
- Open VMware Workstation > Add the corrupted VMDK to a dummy VM.
- Try to power on. VMware may attempt to auto-repair minor corruption.
Option 2: Recreate Descriptor File Manually
If only the flat file is available:
- Create a new .vmdk text file using the same disk size and settings.
Sample line:
RW 20971520 FLAT “disk-flat.vmdk” 0
- Match parameters (disk geometry, adapter type) with the original VM.
Option 3: Use vmware-vdiskmanager
CLI utility from VMware Workstation:
vmware-vdiskmanager -R your_disk.vmdk
- Can attempt repairs or consolidate snapshots.
Mount and Extract Data from Recovered VMDK
If booting is not possible, recover individual files by mounting the disk, as suggested by dbgconway:
Method 1: 7-Zip
- Works only with descriptor-based VMDKs.
- Right-click > Open Archive > Extract files.
Method 2: StarWind V2V Converter
- Convert VMDK to another format (e.g., VHD) and mount in Windows.
Method 3: Attach to Another VM
- Create a new VM.
- Add the recovered VMDK as a secondary disk.
- Boot the VM and access files via file explorer.
Tips to Increase Recovery Success
- Stop using the affected storage
- Clone the disk before scanning or modifying.
- Never write recovered files to the same drive.
- Use professional recovery tools in read-only mode.
- Log all steps in case expert intervention is needed later.
Preventive Measures for the Future
To prevent future data loss, set up regular VM backups using tools like Veeam, Acronis, or native vSphere solutions. Don’t rely solely on snapshots, as they aren’t true backups. Strengthen storage reliability with RAID 10 or ZFS, and actively monitor disk health using SMART data and VMware alerts. Finally, test your recovery process regularly to ensure your backup strategy is effective when it matters most.
The Bottom Line
Recovering a VMDK file from corruption or deletion is not hopeless — with the right tools and techniques, you can often restore your VM or at least recover critical data.
Prevention is the best cure. Set up automated backups and monitor your VM infrastructure actively to avoid disasters in the future.
