Step 4: Remove the attached vmdk file in vm and add the newly converted vmdk file. Step 3: Convert the resized vdi file to a new vmdk file (so that the original file serves as backup) Step 2: Resize vdi file to required hard drive size Step 1: Convert vmdk file to vdi (if you are using vmdk as hard drive) These are notes which I used to perform a hard disk extension in Ubuntu host for a Windows Vista is guest/vm. Please contact the moderators of this subreddit if you have any questions or concerns.This post is due to lack of clear instructions available where I searched for.

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Virtualbox increase disk size vdi