8

I've originally created my VDI to auto-expand to 20GB of virtual capacity.

For performance reasons, I would like to convert them to linear, that is, to have a single, non-sparse, 20GB file sitting on the disk, instead of the dynamically expanding, prone to fragmentation image.

7

Use vboxmanage clonehd:

vboxmanage clonehd olddisk.vdi newdisk.vdi --variant fixed

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