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In order to change OSs on the drive there you will find need to remove or reformat the VFat type journaling file system ext2, 3, or 4 partition(s) presently on the drive to see a new NTFS primary created. GParted will remove the Linux root and swap if present partitions since you are likely familiar with the drive tool.
Once you have a "raw" drive unallocated you have the option to create one or more NTFS partitions for 7 to use. If you elect to use the drive tools included with the 7 dvd through the installation a second 100mb system reserved partition will be seen at the front of the drive holding all boot files and the BCD store(7 boot loader and info).
If you elect to use GParted while booted live to create a new primary(or split the drive) you can select "ntfs" from the dropdown list of file systems when going to format the drive afterwards. Windows 7 will then simply install direct to the drive lacking the 100mb system reserved and see all boot files at the root of C.
The MS design with 7 for seeing the 100mb boot partition serves to protect the boot files from malwares as well as accidental deletions of your main boot files. Certain drive cleanup tools, unintended mishap by novice users, etc..