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The small 63mb seen at the start of the drive sometimes even smaller is reserved for the Master Boot Record(mbr) and seen on just about drive. As part of partitioning any drive with a primary type partition that space will be reserved automatically.
For the 100mb section now reserved by the Windows 7 installer that contains the files and repair tools also seen on the 7 dvd's repair tools section there as well like the automatic startup repair tool making that available as an option when 7 is first starting to load at startup. When pressing the F8 boot menu key this will be seen along with the safe mode, safe mode with command prompt only, Last configuration that worked, and Start Windows normally options.