On modern drives, formatting a drive is not really much different to just writing to the drive. Basically just overwriting it either with blank space (BIOS) or a filesystem (from the OS.) (In the olden days a so-called "physical" format would include the process for actually laying down the tracks and sectors and so-on on the magnetic media. These days drives are generally never physically formatted outside the factory and trying to/doing so would probably destroy a drive, if its even possible.)
Anyway, I wouldn't worry if I was you. (but, do use the "quick format" option, if only to save your own sanity.) </QUOTE]
The only reason I format so often is cos im a very tidy person. I always feel like after a while my HDD is getting really messy and needs a good clean. I won't even install software to try because I know ill have to uninstall it and that will leave bit on my HDD/registry and it will start to feel messy to me.
ANd I love the feeling after you have formatted, and windowns boots for the first time and its all clean. Then start installing your software, and defrag after each big installtion to keep the HDD trim. Done it so many times now I don;t mind the process