I have an Aspire TC-875 desktop, Model D17E5. I want to add two additional hard drives (I'll remove the optical drive), for a total of three HDDs. Where can I get the SATA cable to power the two new drives? I don't know what the white 6-pin connector on the motherboard is called. I imagine that I need a Y-cable for the two new drives, as there is only one additional "white connector" that is unused. Thanks for your help.