Hi @ Wilders I need some help please. Windows 10 Latest version PC built to order AMD Ryzen5 2600 six core processor 340o mhz Bios Version American Megatrends 2006 13/11/2019 BIOS mode UEFI RAM 16GB When I plug in a bootable USB flash drive (say a a Macrium Reflect Recovery USB or any any other) and then reboot. Windows just reboots as normal and does not boot the USB drive. The only ways I can do this are as follows: 1) Via the start menu, holding shift and clicking on restart 2) Clicking on F8 at boot up to bring up a menu and choosing an oddly named UEFI menu item. In either it requires this to be done twice before the USB Flash drive shows in either method. How do I enable USB booting as an option when a USB drive is plugged in and the PC booted? Thanks Terry nb. I am am not an expert so grateful for detailed explanation
Terry, You can put USB first in the Boot Option Priorities. I don't do this. I only have one item in Boot Option Priorities. Windows Boot Manager. I use the F8 method. Edit... Do you have CSM disabled in the UEFI BIOS firmware?
On my HP desktop I moved the USB boot to the top of the list. If I boot normally I can choose Kubuntu or Windows 10, or if I want I can boot into the BIOS to make any changes. If I put the MR recovery UFD into a slot and boot it goes straight to MR Recover. On my laptop I have to press F12 on boot, then I can boot off the MR UFD.
Hi Brian K & Krusty Thanks for your replies much appreciated. @ Brian K I went fishing in the UEFI BIOS because I was not sure what CSM meant or did. Anyway I found in Advanced Settings a Menu Item called Compatibility Support Module> Launch CSM. This was set to Auto. Two other options available Enabled & Disabled. Can you explain why you ask if CSM is disabled? Thanks Terry
Terry, CSM was supposed to have been removed from new Intel motherboards last year. AMD haven't made a similar commitment. CSM allows for legacy (MBR) booting. So when you look at the boot menu you might see double entries. One for MBR and another for UEFI. Confusing. I haven't booted a MBR device for years and I have CSM disabled. The UEFI firmware is said to be more stable with CSM disabled.
Hi Brian Many thanks for your help. So if I disable CSM I will benefit from a more stable UEFI? Are there any disadvantages in disabling CSM? BTW I think my system is GPT, I make this judgement from following one or two threads. I checked in disk management and clicked on Disk1 then right cliced properties then volume. Thanks again for your guidance, I await your reply with interest. Terry
Terry, The only disadvantage of disabling CSM is you can't boot Legacy (MBR) devices. So what! With UEFI systems, the disk containing the OS has to be GPT. Other disks in the computer can be GPT or MBR. They both work fine. In Disk Management you should see a partition labelled EFI System Partition. Try this. Open an Admin command prompt... diskpart list disk (you will see your GPT and MBR disks) select disk 0 (appropriate in a single disk system) list par (you will see your partitions) You should see a Reserved partition. This partition isn't seen in Disk Management.
Hi Brian K Just done what you suggested. Brilliant! Thanks for that. Every time you help me I learn something. Thanks. I am going to turn of CSM Thanks agin Terry
Hi Brian K 1) Yes secure boot is enabled 2) I hit a snag when I set out to disable CSM. A warning information box popped up something to do with a Microsoft driver. I didn't know what it meant and I couldn't take a screenshot. So I cancelled the change. I am going to do it again later this morning and make a note of the details. I woul be grateful if you can then give me yor views. Thanks very much Terry
Hi @Brian K The warning message I referred to in my previous post (When trying to change CSM to Disabled) is as follows: "Due to Microsoft Secure Boot regulations ensure that the Microsoft signed UEFI driver is contained in the plugged PCI-E based storages including M.2 SSD before set the launch CSM to [Disabled]. Otherwise, the PCI based storages will be only available for the Data Drive usage. Contact the PCI-E storage Vendor for the UEFI Driver availability details." Some of the wording is a bit weird. Appreciate your comments and advice. Thanks Terry
Terry, do you have a M.2 drive? I'll experiment with my test computer. You might need to disable Secure Boot, disable CSM and then enable Secure Boot. In that order.
Have you installed the Crucial NVMe SSD driver? In my GigaByte BIOS, I can't enable Secure Boot if CSM is enabled. I have to disable CSM, restart, enable Secure Boot. That's different from your BIOS.
Hi Brian K I haven't installed the driver. I don't know whether I need to and I wouldn't know how. What I will say is this. In trying to help myself I have been researching on the internet and this warning message seems to be known about, particularly in relation to M.2 drives. I haven't found a thread/article that provides a clear solution. Thank you for your help again, it is appreciated. Terry
Terry, Here is the NVMe driver... https://www.crucial.com/support/ssd-support/p2-support Check if it's the correct driver. Your choice but this is what I'd do. Create a backup image Install the driver If there is a problem, restore the image Disable CSM If there is a problem, enable CSM
Hi Brian K Until you mentioned it above I did not know what NVMe was. I then looked it up and found out that it is a faster more expensive M.2 SSD. I got the original info on my SSD using Speccy but since then and using task manager performance tab, I confirmed that the model No was CT500MX500SSD4 (It doesn't mention SATA) This compares with Speccy:- 465GB Crucial CT500MX500SSD4 (SATA (SSD)) I then checked on Crucials website which is remarkably unclear (to me) about which products are NVMe and SATA. If Speccy is correct in its information, then I do not have an NVMe I have the SATA and slower version of M.2 To some extent none of the above is relevant even though I have learnt something. The question is do I have the bottle to plunge into something that is normally above my pay grade and install a driver that might cause problems. Even though you have provided a solution if it does cause a problem. (A backup image). I am going to sleep on it and revisit it tomorrow. Brian thanks for all your help. We have communicated a number of times over the years for which you have been a great help!! I will let you know if I take the plunge, or mess it up. Terry
Thanks Terry. That NVMe driver is not for your M.2. It wouldn't have done any harm but it wouldn't have helped. I'd still try disabling CSM. If the OS doesn't boot, enable CSM. But it's certainly a confusing message you are seeing in the BIOS. Edit... If you are nervous, leave CSM as it is.
