Its in the BIOS settings. All computers will be different. Read your manuel for the BIOS setting and do a google search on IDE vs AHCI for directions before you change it or your hard drive won,'t boot. This may not be your issue but at least take a look at what your SATA controller is set to as in IDE or AHCI.
"Smart enough to know better, to old to care" ------ Dedicated Home Theater, Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 10TB DroboFS NAS