Conversion to NTFS does not require reformatting. Just open a command prompt and type
convert C: /fs:NTFS
It will tell you that you can't convert the current drive, and ask if you want to convert at next boot. Tell it yes, and reboot Windows. The conversion requires a few percent free space, so if the drive is full, disable the swap file, and reboot the VM first. (Expect Windows to be slow unless you've given it a lot of RAM). The conversion is not very fast so you might want to do something else while you wait.
I'd suggest you make a backup of your .hdd file before you start just in case something goes wrong.
Unifying partitions (if both contain data) requires shrinking the old, expanding the new, moving files from old to new, and repeating until all files are moved (or using an external drive). There's no such thing as "unifying" multiple partitions.
Last edited: Nov 10, 2006