Which drive? Unetbootin has nothing at all to do with the hard drive you would be instlling Windows to... that's all in the Windows install process. Windows will even tell you that you must format the drive to ntsf if you start the install and it doesn't find the install hard drive as ntsf format.
Sorry for the confusion Terry, I'm talking about my USB Flash drive. I know that the host HDD must be NTFS for a Win 7 install.
My tests show that if the Thumb drive is formatted to Fat 32 Unetbootin won't work. It appears to create a USB Flash installer
OK, no errors but it won't run. When you boot to it a unetbootin start screen appears and if you click on the only option (default) or wait for the 10 second count down to finish it loops back to the start indefinitly.
If you pre-format the USB flash drive to NTFS you get a device that boots exactly like a USB installer created using the CLI
method and will install Win 7 with no incident.
Incidentally I use Sandisk Cruzer Titanium flash drives (some of the fastest available).
Again sorry for the confusion I often refer to USB Flash devices as drives which they essentially are.
I often refer to hard drives as HDD's (hard disk drives).
Creating a USB Flash drive installer using Unetbootin only seems to work on a NTFS formatted device.
If I want to create Fat 32 formatted installer I've found that I need to use the command line method.
What amazes me is that Linux based Unetbootin works for Win 7 at all.
I tried creating a USB Flash installer for XP using Unetbootin but it failed to boot with an error about a missing "bootmgr" file.