Formatting an external hard drive for mac.

Hi- I just bought a SimpleTech Pro 1TB External hard drive from Best Buy. I already own about 4 other external hard drives of various brands (WD, Maxtor, Seagate, Etc.). If I remember correctly, in the past to format those drives for OSX, I've just gone into disk utility, selected the drive on the left, and went to the erase tab, chose volume format: Mac OS Extended, named it, clicked erase and a few minutes later my drive was ready for use. For some reason now I am getting an error (format failed) shortly after I click erase. It will allow me to choose fat32 to format the drive, but whenever I try for a Mac OS format I get this same error. Any ideas?
By the way, I tried this on a Seagate drive yesterday and the same thing happened. So I returned it thinking it wouldn't work with a mac. So I don't think it's the drive.

Choose partition and GUID in option and after format in HFS+
Message was edited by: Nardac

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Just purchased a Time Capsule to use both as a wireless Network and backup hard drive. Both are working great. However, I have an external hd (500 gig "My Book") I used with a previous computer (PC). I would like Time Capsule/Time Machine to backup everything on the My Book external hd but I realize I need to reformat in order to have the Time Machine backup this drive. It appears that the only way to reformat the external hd is to erase it's contents. This isn't an option for me as this drive is almost full and has a ton of data I do not want to lose. Can anyone elaborate on how I can reformat this disk so it will be compatible with my new setup without losing any of it's contents? Thank you for your time and help.
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http://www.ridgecrop.demon.co.uk/index.htm?fat32format.htm
http://macosx.com/forums/mac-os-x-system-mac-software/270038-format-new-hard-dis k-into-fat32.html
http://en.kioskea.net/faq/sujet-676-formatting-your-drive-with-fat32
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