Yup it'll work no matter where its plugged in. I generally do my primary hard drive on the first sata channel, my secondary on secondary sata channel, and my dvd drive on 3rd (Though on the build I have now i only have 1 hard drive). But thats just my ocd preference, it'll work anyway you like it.
Cooler Master RC-690 Case | EVGA 780i | Intel Q6600 @ 3.2GHz | EVGA 9800 GX2| WD 500GB 7200RPM SATA | Rosewill Xtreme 850w PSU| Samsung DVD+-RW | 8GB OCZ DDR2-800 | Zalman 9700 HSF| 4 120mm Case Fans| Windows Vista Ultimate 64-bit | Acer 22" using DVI |
3dMark Vantage: 21,544