I'm running WinXP as a guest in VirtualBox-4.1.6-74727-Linux_amd64 installed in Slackware 13.37 64-bit. It works fine (well, as fine as XP is actually capable of working if you know what I mean) but I've run out of allocated disk space (10G) and need to expand that to 15G or so and I don't know how to do that.

It was dirt easy in Win7 but I haven't been able to find a guide that's anywhere near current anywhere about doing it with XP -- I do have gobs of disk space available (anywhere between 50G and 150G) if that makes it easier to export and then import to a large space but I'd appreciate thoughts about the best practice to increase XP disk space.

One quick and dirty solution is to create a new hd image and attach it to your vm.

Uh, thanks, but I'm not so sure what that means -- I have a mounted partition, /var/lib/virtual, with 58G available (that's where all virtual machines live) and, to be honest, I don't diddlysquat about Windows (I do try to avoid it as much as possible, but there are a couple of things I use every so often for which there are no Linux analogues, dang it); do I use cfdisk or something to create a NTFS "disk" of some sort of, say, 5G and somehow or other connect that to XP?

Sorry to be so dense, but I really don't have a clue.

Start Virtualbox and open the Storage page in the settings of your XP VM. Select your harddisk controller and click on the "Add Hard Disk" icon behind it. Click on "Create new disk" and go through the wizard to create a new harddisk and attach it to your XP VM. If you now boot that XP VM you will find the second harddisk in XP's partition manager. Just create a partition on it and format it, it will show up in your Explorer after that.

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Thanks, TobiSGD. I wound up with a partition (F), moved a bunch of stuff there and freed up space.

Would have been nice if XP could be extended (like Win7 can) but there's all this stuff about MBR and other things, alas.

Gonna kill the thing pretty soon anyway so all is well that ends.