Correction. There *must* be a space between bcdedit and the forward slash. There is no command called "bcdedit/set" (for good reason)

Good information and thank you - it worked nicely. :)

this works, thanks

I used the ALT commands

This approach worked on my Windows 10 machine - which should have been set up with AHCI in the first place since all of my drives are SSD. However one must know that it may take several reboots for your D: disk to re-appear and become stable. In the first reboot, my data appeared to have been lost. After swearing at the computer several times, I decided that perhaps a reboot would help the situation. Fortunately after 2 more reboots, the disk re-appeared and all of the data was intact.
Thank you for these steps to switch my computer from RAID to AHCI.

Added a Samsung 970 Evo (500GB) NVMe M.2 alongside the existing HDD in new Dell Inspiron 5570. Samsung software couldn't load the drivers because drives configured for RAID. I set AHCI in BIOS and W10 (home) wouldn't boot up. Returned to BIOS to RAID and rebooted successfully. Found this thread and tried it. Yes, it worked! It took a bit of work to manipulate the the drive letters afterwards but got there eventually. Thank you for the information.

I had a really odd experience attempting this on Windows 10, but I finally figured it out:
When I switched to AHCI and got to the safeboot menu, my keyboard wouldn't work. If I tried to get to the keyboard settings nothing happened. I was able to get to the Command Prompt terminal via the 'Windows Systems' tab in the Start Menu. Once I had opened the Command Prompt, I could type in it using the on-screen keboard (Start Menu -> Settings -> Ease of Access -> Keyboard (scroll down and it's on the left) -> On-Screen Keyboard). Then I typed bcdedit /deletevalue safeboot (there didn't seem to be a way to use curly brackets). Then I Rebooted, and found that I had left Safe Mode, and everything was back to normal :)

It's one hell of a work-around, but hopefully this helps somebody!

Thanks @Evan! The keyboard thing also happened to me, but using the virtual keyboard did the job. If you press the shift key you'll be able to use curly brackets!

Thank you very much! I am running Server 2016 and didn't realize my Intel board was in IDE until I tried to run two SSD's in Raid0 and was only getting about 400MB/s. I switched to AHCI and was getting "Inaccessible boot device". I used the method described above and it's working now! 1100MB/s.

Worked perfectly on a Dell Inspiron 15 7586. Came pre-configured in RAID mode and updated to 970 EVO Plus without the ability to get the Magician to function.
As soon as I completed the operation which took about 3 minutes, everything worked perfectly with no glitches or issues

Saved my day. Alternative command is somewhat confusing. I used bcdedit /set {current} safeboot minimal and bcdedit /deletevalue {current} safeboot
Result is that W10 booted with sata settings set to AHCI, Happy!

Thanks for sharing!

Saved my bacon!
I got my ageing (10yrs) Dell T5400 back into life using the full commands.

Very many thanks!

Just performed the procedure on an old Dell D630 fitted with a Kingston SSD that didn't have AHCI enabled.
Went flawlessly and machine now seems to boot a little quicker and feels quicker in operation.

Many thanks!

This worked for me! Thank you, thank you, thank you.

At some point my intel RST drivers stopped, and I was unable to reinstall the drivers. I thought it was a windows 10 1903 build issue however my system was still on 1809. The problem was at the BIOS level. Some how either through a BIOS update or a dead battery the BIOS storage configuration changed from RAID to IDE.

Without RAID enabled in the BIOS the RST drivers will not install. Also be sure to select the correct driver for your chipset. The newest drivers are not fully backwards compatible!

However even if I manually installed the RST x64 drivers first and then changed the BIOS to RAID the system would not boot.

I opened windows disk management utility and confirmed that the RAID 1 array was broken. Both disks appeared in the drive list, with one showing a warning due to addressing conflict (oh no)

Steps
1) installed the newest intel RST x64 driver that supports the chipset
2) set safeboot per above
3) enabled RAID in BIOS (was IDE)
4) booted to safemode
5) removed safeboot per above
6) checked that intel RST is running YES!
7) verify RAID 1 array (no idea how long the array was broken)

run windows disc management tool and verify RAID now appears correctly as 1 drive

After this Through some update cycle windows stealthily replaced all of the chipset and storage drivers with generic MS drivers.

I hope this helps someone else

to enter bios is a separate step. On my PC it is hitting "DEL" key during reboot.

on cmd
C:\WINDOWS\system32>bcdedit /set {current} safeboot minimal (ALT: bcdedit /set safeboot minimal)
Invalid command line switch: /set
Run "bcdedit /?" for command line assistance.
The parameter is incorrect.

As previous comment.
on cmd
C:\WINDOWS\system32>bcdedit /set {current} safeboot minimal (ALT: bcdedit /set safeboot minimal)
Invalid command line switch: /set
Run "bcdedit /?" for command line assistance.
The parameter is incorrect.

Awesome. This worked.

After activating safe mode and changing the BIOS to AHCI, windows goes into automatic repair mode, could someone help me?

(ALT: bcdedit/set safeboot minimal). No space between bcdedit/set

Worked perfectly on a Dell XPS 13 9360 (i7, touchscreen, SSD). Stupid question: Why doesn't the WIndows automatic repair do this?

Hi everyone, I have the same problem as Vignesh NALLAMILLI. The safeboot is set correctly, in fact, I'm able to boot into the windows' safeboot mode. However, when I change the SATA operation to AHCI, the computer (Alienware m15 with two SSD drives) doesn't boot into the operating system and start a sort of Alienware self-diagnostic mode.
Can anyone help me out with this problem?

This article is a LIFE SAVER!!!!! I'm in the process of migrating a new Windows 10 installation from a 2TB HDD to a 1TB SSD. This is a new (refurbished) Acer desktop system that came with RST with Optane configured in the UEFI settings. So, I followed the steps to switch it to AHCI and Windows 10 now boots. I'm now off to re-clone the HDD to the SSD. :)

For those having problems running the bcdedit commands, the "ALT" commands are supplied as *alternate* commands to use. So, either run the bcedit command that appears *before* the parentheses or run the command INSIDE the parentheses, but not the commands as shown above.

For me, I ran these commands:

bcdedit /set safeboot minimal

(then I rebooted and switched to AHCI)

bcdedit /deletevalue safeboot

THANK YOU for writing such clear and accurate instructions!

Peace...

Worked flawlessly, thank you!

It's 2a.m. God bless you.

@Tom williams thank you very much for better explaining this tuto !
because it did not work because of ALT in the tuto!
and i confirm : it woooooooooorks !!!!! :-D

I have an asus Z97-A motherboard and Intel rapid storage technology is automatically activated in my bios and it automatically activates RAID and i didn't want to.
I wanted AHCI. Every time i reselected AHCI, i had a blue screen crash !

Thanks to this great tuto i can finally! :) i did not believe it and yet it works perfect!
I will see if the file transfers are accelerated in writing with my SSD samsung 850 evo 250go :) because before in RAID i never exceeded 80mb/s for files of 20 - 100go approximately when my ssd can go much higher...

I forgot to specify that i am under windows10 pro 64bits in 1909 and i am in UEFI only. thanks again ;)

This absolutely destroyed my PC. Be careful

Hi, this didn't only half-worked for me. Let me explain:

I have 2 drives installed, one a normal HDD and the other SSD. Both have Win 10 installed so it's dual boot.

While running the PC with SSD as boot drive, I was not able to enter Win 10 after changing the setting in BIOS to ACHI i.e. BSOD. I had to change it back to IDE in order to boot up via the SSD.

I then tried running the PC with my HDD as boot drive. Everything all the steps above went thru smoothly and when I checked in Device Mgr and BIOS setting, ACHI was enabled. So since Win 10 had the ACHI drivers installed, I returned to the BIOS to set my SSD to boot up. It went to BSOD again. So right now for me to use the SSD to boot up my BIOS setting has to be set at IDE.

For information, my SSD was installed with Win 10 in the normal way. The SSD was actually cloned from my HDD since prior to obtaining the SSD, I had upgraded from Win 7 to Win 10 whilst using the HDD. Could this have caused the issue I am facing?

Any help would be appreciated.

Correction, it should be my SSD was NOT installed with Win 10 in the normal way.

I cloned a normal HD onto an SSD, so the setting was at ATA in the bios. Windows ran fine with ATA setting booting from the SSD. I booted normally into Win10, set the safemode, rebooted and changed the BIOS setting to AHCI and booted. Win10 booted into safe mode. In there changed the setting back to normal boot and now its running in AHCI mode.
Awesome! Thank you!

Este autor se merece una ceveza bien fria.

Thank you a lot.

Worked like a charm!
Shukria :)

PERFECT! I was trying to install Linux Mint 20 on a brand new laptop that was running Intel RST by default. Linux couldn't install while RST was enabled, your command prompts and easy instructions in the BIOS made this a breeze. Thanks!

thank you so much

Worked perfectly (used the shorter ALT commands) on my 12-year-old system that, with SSD and a few other upgrades along the way, is still running fine.

I'm having the same problem as Davide Berghi here.
Alienware m15 r3 with two SSD's in RAID0 does not boot into Windows anymore after switching to AHCI. It goes into a diagnostics mode and fails to detect any bootable media.

Only after switching back to RAID in the BIOS, Windows boots into safe mode.

Is the issue here that we're using an actual RAID (so Windows data is striped over the two SSD's)? Or should AHCI be able to handle that anyway?

I have been trying to dual boot a Dell 5593 laptop with Windows 10 and Linux. If I set disks to RAID, Linux won't load. If I set it to AHCI, Windows won't load. This cure has at least got me part of the way there. I can now boot Win10 in AHCI mode. Now all I have to do is get the machine to boot into the Linux memory stick and take it from there. Thanks to all of you guys who take the time and trouble to help out the rest of us. Give yourself a pay rise.

Thank you - with your instructions I was able to install Ubuntu 20.04 on a new Dell XPS 17 9700

Hello, I bought a new Dell Laptop Inspiron 15 5000, windows 10 pre-installed. I want to install ubuntu 20.04 alongside windows 10. I am getting error "Turn off RST". How to safely resolve this issue?

Thank you for the help.
After Step 6 i.e once I reboot and enable AHCI, the windows boots fine but the delete command doesn’t work. Do I need to run the delete command aa well or its fine cuz I am confused now

I have a SSD with Windows 10 ans two mirrored HDD with data.
I want to switch from BIOS-RAID to hardware raid, to be able to install Linux one a seconf SSD.
After enabling safeboot, and switching to AHCI, I get prompt to enter a propper boot device.
So I think there hase to be done a little bit more, if Windows 10 has ben installed in RAID mode.

Thank you, this made my Ubuntu installation on my Dell Inspiron 5400 so easy, after i had almost broken my Windows lol
Perfect tutorial

I used the alt and it worked completely fine, going from IDE to AHCI.

Not working for my Asus Vivobook with ssd.
The message displayed is:
"Invalid command line switch: /set
Run "bcdedit /?" for command line assistance.
The parameter is incorrect."

Please help!

Sorry for the previous comment.

It works perfectly!

hi kids
/set parametr in bcdedit return error

i did it much simpler

- to enable F8 key (safe mode) use command
(In win 10 Build 1909 or leter)
bcdedit /set bootmenupolicy legacy

- in Windows control panel / system /device menager / remove the hdd drive with system and confirm reboot
- ater reboot go to BIOS setins and set the AHCI mode save setings and exit bios
- next reboot go to safe mode command prompt by F8 key
- in safe mode command run chkdsk /f and confirm ( i dont know if its nesesary but i did the step)
- reboot system by CTRL+ALT+DEL
- done
sorry for my language (i don't know english)

This worked for me. While changing to AHCI it still shows the warning, but nothing get erased. All of my data and files are still intact. And I am able to see my SSD drive in Fedora 33 installation.

Thanks.

Worth noting that if you are changing this on a gaming machine, you need to go into your BIOS a second time after the tutorial steps.

This is to make sure you have changed from IDE to ACHI in all the overclocking profiles, because the profiles don't save just the overclockable properties, but all of the editable ones - including the IDE/AHCI switch, which will cause serious problems if you later switch between BIOS overclock profiles!

Also, its worth noting for older motherboards that are an update install to windows 10 from Windows 7/8 (and therefore stuck on IDE, which will be the most common reason this occurs at all), the hard drive controller is typically already stretched with IDE, and you won't get any real gains.

For example, when I changed from IDE to AHCI on an X58 board, the overall performance was largely the same. The controllers on these boards won't give you much more than 250-280MB/s, which you will already be reaching with IDE.

I do the first step and when i reboot my pc it ask me for a password but i try ti use pin that I usally use to unlock the laptop but it dosen’t work i try to reboot a secodnd time and black screen

So AWESOME!!! Thanks!
Had an "Oh Bugger!" moment when I realised that I had installed Windows 10 to a new SSD in IDE mode.
Saved the above instructions to a txt file on the desktop for copy and paste into cmd prompt purposes, and it all worked a treat. This saved me a heap of time not having to re-install all over again.
Many praises.

I'm having a problem applying this. I go to the command prompt, set it to boot to safe mode, restart, go to BIOS, switch to AHCI, save and exit. The computer restarts, but after the BIOS flash screen just goes to a black screen with a blinking cursor. Never proceeds from there.

I can restart, go back to BIOS and switch back to IDE, save and exit, and the system starts in safe mode and I can unapply the start to safe mode command. But how can I get past being stuck on a black screen with blinking cursor when I switch to AGCI?

You have to use the password that you used before you set the pin.

Thank you sooo much! This worked too well to be believed.

Hello, help needed...

Second part in safe mode

bcdedit /deletevalue {current} safeboot (ALT: bcdedit /deletevalue safeboot)

Bring me error

The delete command specified is not valid

:(

P.s. done that.
Removed second part of command ALT
And everything finished perfect!

Thanks a lot for the livesaver trick!!!

Hi, i have a big problem with my laptop with optane and a damaged windows.

Maybe you look here: https://answers.microsoft.com/de-de/windows/forum/windows_10-update/kein-boot-nach-upgrade-1909-auf-2h20-zwei-windows/0ed42c18-97f3-407d-b5e7-af2c5c3a0cb0?tm=1607170275167

Or here: https://m.facebook.com/groups/53367057696/permalink/10159335758652697/

The Links are german, maybe some of you experts speak german, but you can answer in english too.