Apple Boot Camp MacBook Air (Late 2010) - Manual (Page 6)

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4 When you’re asked where to install Windows, select “Disk 0 Partition 3 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.
5 Click “Drive options (advanced).”
6 Click Format, and then click OK.
7 Click Next.
The Windows partition is formatted using the NTFS file system.
8 Follow the on-screen 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.