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#21
It is useful. It boots the operating System.
If you don't want it, then go ahead and Mark C Partition Active and run Startup Repair - Run 3 Separate Times to see if it will start with System flag on C, since sometimes C can't be made to boot itself and you must move the Active flag back. Only when System is on C should SysReserved be deleted.
And the space is too small to bother with resizing C into, which presents it's own (unnecessary) risks.
Going forward, if one doesn't want it then pre-partition the HD before install using a bootable partition manager like Partition Wizard. Again, more wasted time and for what benefit?