It's too big to do it in properties or command prompt, so what do I do to make it do it anyway? I know there's ways, I'm just having difficulty finding them. And it's frustrating when you spend several hours trying to reformat it, and then, right at the end, it tells me that it can't do it. I'm running Windows Vista service pack 1. The external hard drive is approximately 150GB and currently formatted to NTFS. I need it to run on both PC and Mac, so it needs to be FAT32. So... if someone can rescue a poor soul who hasn't ventured in this direction of hardware... you'd have the satisfaction of knowing that you helped me in my arduous path to complete my digital photography program.
I would try (in Windows): Control Panel -> Administrative Tools -> Computer Management - Then click the "Disk Management" snap-in under Storage, and try formatting it from there (make sure you select the right disk).
Never mind guys, I got it working. Windows will only format into FAT32 up to 32 GB. Any volume larger is too large, and it doesn't tell you until the very end. It still removed all the data (even though it took an hour and a half to be told the volume is too large a second time), so when I got to school, it only took 2 seconds to format it. Apparently Mac is a lot smarter than Windows in that particular area. Human, I tried it from the command prompt and it didn't work, so I don't think that would have worked either. I read that you need separate software to do it on a PC running Windows, and after failing several times, I'm liable to believe that information.
