Differencing virtual hard disk is available in Vbox

[a cooperator]

Hi everyone.

I know that Differencing virtual disk is available in Microsoft Windows 7 Virtual updates, however, I don't know if it is available in VBox as well or not.

Dynamically expanding virtual hard disk: The size o this virtual hard disk increases as data is written to it.

Fixed size hard disk : The size of this virtual hard disk is fixed and doesn't increase as data is written to it.

Differencing virtual hard disk: it stores changes in a separate disk so that you can isolate changes to a virtual machine and leave the original disk intact

[Martin]

Did you read chapter 5 of the manual?