Let's say the hard disk has some other partition already taking up all the space. Looking over http://www.blackviper.com/Articles/OS/InstallVista/installvista1.htm and starting and steps 9, 10, 11, etc. we see where we can delete the old partition (hope you didn't want what was on that) and start over.
If you have some SATA RAID driver and forgot it during the install that can happen to result in 0 byte size too.
I'm trying to install new HDD with Vista but when it reaches the point to choose where to install windows it's showing 0mb of space available on my HDD. Thoughts?