04-29-2018 01:11 PM - last edited on 03-05-2024 08:19 PM by ROGBot
04-29-2018 02:45 PM
04-29-2018 08:58 PM
04-30-2018 12:45 PM
R5Eandme wrote:
Hello,
I think the behavior you are seeing might be perfectly normal. When I was learning about UEFI booting (CSM disabled) vs. legacy booting (CSM enabled) I was at first confused why some devices didn't show in the boot list with CSM disabled. Only devices with the UEFI boot manager will show, and will be labeled Windows Boot Manager or UEFI: device name, etc. These devices contain the EFI directory with the UEFI boot manager as EFI/BOOT/bootx64.efi or EFI/BOOT/bootmgfw.efi
But with CSM enabled, any boot-capable device will show in the list, even those not set up for UEFI boot with the EFI/BOOT directories. You might be interested in this post:
https://rog.asus.com/forum/showthread.php?96196-I-need-advice-on-CSM-and-Secure-Boot-settings
04-30-2018 07:54 PM
SumTingWong wrote:
None of my drives labeled Windows Boot Manager or UEFI device name. My OS is installed on my Samsung SSD. In the BIOS, it displays Samsung SSD not Windows Boot Manager: Samsung SSD.
04-30-2018 12:42 PM
pndiode wrote:
Boot\CSM (Compatibility Support Module)\Launch CSM - Disabled
Boot\CSM (Compatibility Support Module)\Launch CSM - Enabled
I had a problem with two Hard Drives not showing that were made in 2010, but they worked fine. I replaced them when they started disappearing and appearing in windows.
04-30-2018 02:30 PM
04-30-2018 07:52 PM
SumTingWong wrote:
The pictures of my BIOS are here https://imgur.com/a/JzAtayM
05-01-2018 03:27 PM
R5Eandme wrote:
Hi SumTing Wong,
I see that you have an older motherboard with Z97 chipset, and you said "Boot Device Control was set to UEFI and Legacy OPROM. Launch CSM was enabled as well." Enabling Legacy OPROM means that older devices can be used for booting, and this requires CSM enabled: "Compatibility Support Module" allows for older boot devices. It appears that the BIOS considers only your Samsung SSD and optical disc drive to be bootable devices. The Seagate and WD HD and not considered to be boot devices. It could be that your boot type is UEFI, and therefore only devices that have the UEFI Windows Boot manager (i.e. Samsung SSD containing the partition EFI/BOOT/bootfwmg.efi) or can have the boot manager (e.g. Windows DVD install disk) will show up in the Boot Priority List. If you have UEFI booting, the Seagate and WD HD would not show up in the Boot Priority list because there isn't a Windows Boot Manager installed on them. I don't think this is a problem for you, and you should still be able to use the Seagate and WD HD for data storage.
You can detect if you are using UEFI boot type by running the Windows disk management console and look at the partition scheme for your Samsung SSD. It should be similar to the following, with an EFI partition present:
05-01-2018 06:33 PM
SumTingWong wrote:
I figure out that my BIOS Mode was set to Legacy instead of UEFI, so I converted my OS Samsung drive to GPT without data loss. Now, I can boot into the OS with CSM disabled no problem. Also, in the BIOS it shows Windows Boot Manager: Samsung SSD and Samsung SSD in the boot priority as well as my optical drive. Unfortunately, my WD and Seagate HDD are not show up in the Boot Priority EZ Mode and Boot Option in Advanced Mode > Boot. Now, my BIOS Mode is UEFI instead Legacy.
I did created a UEFI bootable Windows 10 USB. If I want to do a clean install of Windows 10, do I have to disable CSM?