Ticket #5990 (new defect) — at Initial Version

Opened 13 years ago

Last modified 10 years ago

Snapshot VHD is not a valid file format

Reported by: atpetro Owned by:
Component: virtual disk Version: VirtualBox 3.1.2
Keywords: VHD, Differencing, Snapshot Cc:
Guest type: Windows Host type: Windows


I have a VHD that I can configure and boot from VirtualBox without any issues. I can also create a snapshot and boot that from VirtualBox without any issues. I want to port the parent and child VHDs to MS technologies - Virtual PC for 32-bit or Hyper-V for 64-bit. Unfortunately, the VHD that VirtualBox creates for the differencing drive is not a valid VHD format. Nothing but VirtualBox can load the differencing file - WinImage, VirtualPC Disk Wizard and Hyper-V Edit Disk all fail to load the snapshot VHD. If I create a differencing disk using Virtual PC, then all three of those tools can read both the parent and the child VHD. I can also use the diff drives created by VirtualPC as valid snapshot files in VirtualBox (after manual xml manipulation). Please fix the VHD diff drive format so our work can be portable and we can recover files with tools like WinImage when corruption occurs. This is possibly related to why merge isn't working for VHD snapshots - ticket #5981.

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