Virtualbox compression VDI

Virtralbox uses a VDI file to provide a virtual hard disk for the virtual machine. The hard disk of the virtual machine will increase with the running time.

Therefore, certain compression is required.

However, before compression, backup is required to avoid faults.

Copy it first

CP win7.vdi win7.vdi. BK

Copy-based UUID Conversion,

Vboxmanage internalcommands sethduuidWin7.vdi

UUID changed to: 6236ee91-d2d6-48d2-b3c7-1b2753e7cf25

Vboxmanage modifyhd win7.vdi -- compact
0% ..... 10%...
You can. The conversion may take a long time. Please wait.

After testing, I found that the conversion of my 19g win7 was not very effective.