dynamik wrote: What virtualization software are you using? I use VMWare Workstation, and I don't remember seeing an option to increase the size, but it might be possible. What did you put as the size of the drive when you created it? Preallocation doesn't affect the available space of a virtual drive. It just increases performance at the cost of taking space from your host drive that you may not actually have used. If you don't need it to be contiguous, you can simply add another virtual drive.
dynamik wrote: Yea, it allocates it as you need it, which is why it will negatively affect performance (but save your host drive space until you fill up your drive) when you add data to it. However, you should have still specified a drive size when you created your virtual drive. That's going to be the hard limit you'll run up against. I actually researched increasing virtual drive sizes, and it looks like quite a convoluted process. The easiest method I came across was to just add a second virtual drive that's the size you want, and image the data over to it.