1.    08 Apr 2017 #1
    Join Date : Apr 2017
    Posts : 5
    win 10 pro x64

    Had to Switch to AHCI to Do Clean Install/Re-partition, Switch Back?


    I just got an alienware 13 r3 laptop w/ win 10 pro pre-installed. The hard drive is one 500gb ssd drive. I wanted to partition the drive so that my OS was on a 140gb partition, and then the remaining volume for a media drive.

    I wasn't able to shrink the original install volume down enough so I had to do a clean install. I used the media creation tool to create a bootable usb drive. The usb drive was bootable and setup would load but at the media selection page there were no drives visible.

    After some research and whatnot I was able to determine that disabling Secure Boot and switching the sata mode to AHCI from RAID did the trick. I was able to re-partition and install win 10 pro.

    I have turned Secure Boot back on and I got a warning when I made the change do but the system still boots fine. I haven't changed the sata mode back to RAID because I get a similar warning message and I'm not sure if it will have any effect.

    Do I need to? Does it matter? Will it cause a problem? It's a laptop with one drive, does raid even matter in that situation?


    This is for UEFI boot systems not legacy BIOS but it may still apply. I don't know.

    Thanks for your help.
      My ComputerSystem Spec
  2.    08 Apr 2017 #2
    Join Date : Jul 2015
    Posts : 9,414
    Windows 10 Pro

    I don't see any reason to use RAID if it has only one drive. Maybe I am missing something, though. I would leave it on AHCI.

    The way you would change it, though, would be to boot into Windows in safe mode. Delete the device manager entry from the AHCI drive controller. Reboot the computer into UEFI settings and change the mode to RAID. Reboot the computer back into Windows safe mode. Turn off safe mode, reboot the computer back into normal Windows and hope for the best.
      My ComputerSystem Spec
  3.    08 Apr 2017 #3

    It is better to use AHCI for SSDs.
      My ComputersSystem Spec
  4.    08 Apr 2017 #4
    Join Date : Jul 2015
    Posts : 9,414
    Windows 10 Pro

    And you might want to look at the disk controller driver in Windows. Using the proper Intel or AMD drive controller for your chipset will improve performance, but you will have to load it manually.
      My ComputerSystem Spec
  5.    08 Apr 2017 #5
    Join Date : Apr 2017
    Posts : 5
    win 10 pro x64
    Thread Starter

    Quote Originally Posted by NavyLCDR View Post
    I don't see any reason to use RAID if it has only one drive. Maybe I am missing something, though. I would leave it on AHCI.The way you would change it, though, would be to boot into Windows in safe mode. Delete the device manager entry from the AHCI drive controller. Reboot the computer into UEFI settings and change the mode to RAID. Reboot the computer back into Windows safe mode. Turn off safe mode, reboot the computer back into normal Windows and hope for the best.
    Thanks. That's what I thought.
      My ComputerSystem Spec
  6.    08 Apr 2017 #6
    Join Date : Apr 2017
    Posts : 5
    win 10 pro x64
    Thread Starter

    Quote Originally Posted by NavyLCDR View Post
    And you might want to look at the disk controller driver in Windows. Using the proper Intel or AMD drive controller for your chipset will improve performance, but you will have to load it manually.
    Okay. Dell has all those drivers available for download from their support site.
      My ComputerSystem Spec
  7.    08 Apr 2017 #7
    Join Date : Apr 2017
    Posts : 5
    win 10 pro x64
    Thread Starter

    Quote Originally Posted by swarfega View Post
    It is better to use AHCI for SSDs.
    That's good to know.
      My ComputerSystem Spec
  8.    08 Apr 2017 #8
    Join Date : May 2014
    Cross Plains, WI
    Posts : 318
    Windows 10 Pro x64

    Quote Originally Posted by hyjinx80 View Post
    Okay. Dell has all those drivers available for download from their support site.
    I made a similar change to my Dell Precision M4800 (specs listed under second system in My System Specs). If anything Ive noticed a performance improvement (albeit slight) after changing to AHCI mode from RAID. With only one drive, RAID is rather pointless unless there is a reason for it that I am unaware of. So unless you have a real reason for wanting to use RAID, I would leave it as AHCI.
      My ComputersSystem Spec
  9.    08 Apr 2017 #9
    Join Date : Sep 2014
    DFW Area
    Posts : 439
    Windows 8&10

    Dell uses RAID on systems with M.2 PCIe SSD drives so they can run them using the SATA controller. Basically, if the SATA is set to AHCI the system may, if able, boot to the PCIe device. If set to RAID it stays as SATA.

    Installing Ubuntu requires those systems to be set as AHCI or it won't see a PCIe drive.
      My ComputerSystem Spec

 


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