One of those partitions is the factory restore partition - It might have specific drivers and such that are nice to have around (saves you the search and download game). I'd keep that just in case (and the restore partition is usually pretty small anyway)

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2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)