If you simply talk about creating a new virtual machine, it makes no difference. You can open vhd under windows7 Ultimate without tools. Vmdk is the format of vm virtual machine, which can support. Vdi is the format of virtualbox itself.

Details are as follows:

Computer common problem solving

1, unable to automatically identify the hard disk controller.

This error is easy to occur when installing the system with a single operating system CD that is not genuine. The reason is that the hard disk controller driver automatically loaded by non-genuine CD does not meet the needs of the computer itself. In this case, it is recommended to install the operating system on a genuine CD.

2. Manually update the wrong driver.

The Windows operating system works normally, but the manual driver update is not correct for the hard disk controller, which leads to this failure. The solution is to enter the advanced menu of windows system, select the last normal configuration, and enter the system normally.

3, caused by changes in bios settings

Windows operating system is normal, but for some reasons, the user modified the bios settings, resulting in 0x0000007b failure.