Front Discs / Rotors
#17
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Ok, guys be careful here in comparing apples to apples. There are rotors with hats and rotors with "floating hats" (AP). The floating hats dissipate heat better and should last you a full season of track events - thus a higher cost.
#19
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vegasgolf98 is correct. There are two basic types of disc attachment to the hat, bolted or floating. Bolted is used for smaller discs and especially for off-road where dirt can clog a floating system. Floating is used for larger discs and allows for axial movement and radial heat expansion of the disc.