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Virtual Time Machine

One of the advantages of virtualization is that it lets you test applications (and

in some cases, hardware devices) in an isolated environment. But once you

soil that environment with software or drivers, it’s no longer the “clean room”

it once was. Rather than delete the virtual machine and start over, there are

ways to revert back to earlier stages—an undo, if you will—to save you time

and trouble.

If you’re using VMware Workstation, just open the VM menu, select Snap-

shot and then Take Snapshot. Name the snapshot and click OK to save the

current state to your hard disk. Thereafter, changes you make to your virtual

hard disk (software you install, files you delete, etc.) are saved in a separate

file on your real hard disk.

You can revert to a saved state at any time; from the VM menu, select Snap-

shot→Snapshot Manager, select the snapshot you wish to use and click Go

To.

Microsoft Virtual PC doesn’t have a snapshot feature, but you can get a crude

approximation, provided you have enough free disk space. When the virtual

machine is in a state you’d like to save—like right after you’ve installed Win-

dows and VMA—shut down the virtual session. Then, open Windows Ex-

plorer on the host and navigate to the folder containing your .vhd virtual hard

disk (usually Documents\My Virtual Machines). Using the right mouse button,

drag your .vhd file to another part of the same folder and select Copy Here,

creating a duplicate copy (e.g., Windows 7 - copy.vhd); that’s your snapshot.

To revert to a saved state, make sure your Virtual PC session is shut down,

and then reopen Windows Explorer on the host. Delete or rename the .vhd

file in use, and then rename the backup (e.g., Windows 7 - copy.vhd to

Windows 7.vhd).

Run a virtualized Windows 7 x64 in Windows 7

Here’s

a handy way to create a clean Windows 7 install for testing purposes.

For this you’ll need the VMWare Workstation software and the 64-bit edition

of Windows 7 running on the host PC. (The same procedure also works if the

host is running Vista x64 or XP x64.)

Start VMWare, and from the File menu, select New and then Virtual Ma-

chine (or press Ctrl-N). On the first page of the New Virtual Machine Wizard,

select Custom (advanced) and click Next. From the Hardware compati-

bility list, select Workstation 6.5 and click Next.

36 | Chapter 1: Get Started with Windows 7

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