Apple Boot Camp (OS X Lion) - Manual (Page 7)

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2 When you’re asked where to install Windows, select the partition named “BOOTCAMP.”
NOTICE: Do not create or delete a partition, or select any other partition. Doing so
may delete the entire contents of your Mac OS X partition.
3 Click “Drive options (advanced).”
4 Click Format, and then click OK.
5 Click Next.
The installer formats the Windows partition using the NTFS file system.
6 Follow the onscreen instructions to finish installing and configuring Windows.
After you install the Windows software, your computer automatically restarts using
Windows. Use the Windows setup screens to configure Windows.