Today I realized that my Windows hdd file is 37GB and I need to clear up some space on my computer. I tried using the disc compact function, but it complained that I had either snapshots or an undo disk. I did have a bunch of snapshots so I spent the rest of the afternoon removing them (it took forever). Once the snapshot manager said "No Snapshots Available", I tried the compacter again. Again it complained with the same error. I wish it were more specific. * I have no snapshots * The undo disk is disabled (under Options > Advanced) The virtual machine was created through transporter (pulling windows from another PC). Could this be the cause? Here's the full error in all of it's glory: What is a "plain disk"? Thanks!