HOWTO -- working with .vdi files

• Clone a .vdi disk image, so it can be used on a second VM
  vboxmanage clonevdi
• resize a dynamically-expanding .vdi
  vboxmanage modifyhd --resize
  That merely changes the size of the drive itself. You still have to go in and resize the partition (eg. with a tool like gparted)
• resize a fixed-size .vdi
  create a new .vdi and do drive-imaging (eg. Clonezilla) to copy the data to the new drive [1] [2]
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reference -- working with .vdi files

• vboxmanage commands relevant to .vdi files
  • vboxmanage createhd
  • vboxmanage modifyhd
  • vboxmanage clonevdi
  • vboxmanage convertfromraw
• hard drive formats that are supported (in some way) by the vboxmanage command
  • .vhd
  • .vmdk