I have a P35 Chipset and this is the procedure that worked for me even though bios doesn't say enhanced only AHCI. 1. Downloaded Newest Intel® Matrix Storage Manager for my board. 2. Command Prompt ran c:\anyfolder\filename.exe /a 3. Copied IaStor.sys from \Program Files\Intel\Intel Matrix Storage Manager\Drivers folder to C:\Windows\System32\drivers\ 4. Copied the following registry file into notepad and saved as ahci.reg 5. Double clicked newly created file to install to registry. 6. Reboot and change bios to AHCI 7. Double clicked on previously downloaded Intel® Matrix Storage Manager installer. And Rebooted. 8. Go to device manager, double klick your hard-drive(s) under "disk drivers", go to "policies" tab and mark "Enable write caching for this disk" _____________________________________________________________________________________ Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\CriticalDeviceDatabase\pci#ven_8086&dev_2922&cc_0106] "Service"="iaStor" "ClassGUID"="{4D36E96A-E325-11CE-BFC1-08002BE10318}" [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStor] "Type"=dword:00000001 "Start"=dword:00000000 "Group"="SCSI miniport" "ErrorControl"=dword:00000001 "ImagePath"="system32\\drivers\\iaStor.sys" "tag"=dword:00000019 "DisplayName"="Intel AHCI Controller" [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStor\Parameters] "queuePriorityEnable"=dword:00000000 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStor\Enum] "0"="PCI\\VEN_8086&DEV_2922&SUBSYS_B0051458&REV_02\\3&13c0b0c5&0&FA" "Count"=dword:00000001 "NextInstance"=dword:00000001 ______________________________________________________________________