Motherboard: Gitabyte 970A-UD3 (AM3+ / SATA 3) CPU : Phenom II X4 965 SSD : Crucial M500 240 SATA HD : WD Blue 1TB 7200 RPM, SATA DVD-RW : LG 24x SuperMulti SATA When I finished my build, which has an SSD System drive and a Platter Data Drive, both of which are SATA, I neglected to change to AHCI mode in BIOS. The drives all showed up in BIOS, but Windows did not see the Plater Drive, which should have been Drive-D, however it did see the SSD as Drive-C. Then I remembered that I needed to set AHCI, so I did that, and then both drives were shown in Windows. Yes, for other reasons, I also did a reinstall of Windows 7, so that Trimm and other items were automatically set, and I have double cheacked this items. My question is this: In BIOS, under the AHCI setting, where you would expect to see the list of drives, like are shown when in IDE mode, there are just empty blued out lines. No drives are listed. On the other hand, when I go to the Boot priority section, the SSD is shown, the DVD is listed, and LS-120, but the second HD is still not shown. All is working perfectly, so I am wondering if this is normal when in AHCI mode.