Hi Dieter,

Unfortunately I have tried the repair function multiple times. I have tried refreshing and resetting the pc which are the options on the win 10 image. I have also performed multiple clean installs as I have been trying different options, with uefi and things. The last install I tried was in legacy mode with raid enabled. I booted into recovery first and used CMD to clean and repartition the drives, then rebuilt the raid array. I performed a full clean install that was successful, the install went through its usual restart process at the end, as soon as the machine was reloaded - no boot device found.

For some reason the boot sector does not seem to be installing correctly - or my first suspicions, the bios does not know how to read the striped array. I would be grateful if you had any other ideas!

- Liam

Hi Dieter,

Quick update for you. I have managed to get the raid working, but I am not sure how!
First option I tried was to swap over the drives, so the slightly larger drive was in sata0 slot. I also reduced the size of the raid by 500mb to make sure it wasn't trying to write to a section of the smaller drive that didn't exist.
Finally I went into the bios settings, I disabled all legacy features, all intel / dell features in the bios and made sure it was running as basic as possible. I then re-ran the install in uefi mode.
Again the boot failed after the install. However this time instead of rebooting manually I hit f1 to retry reboot... and somehow it found the OS and booted...
I installed updates, rebooted, once again it failed to boot, no uefi devices found. I hit F1 to retry and it boots straight away...
So it seems everytime I turn on the laptop it tells me it cannot find the boot device... when I retry it then boots fine! Strange issue now but atleast it is working...

- Liam

The above was fixed by changing boot order to raid0 first.

Seems to be all fixed, one of the above things worked I'm just no idea which part it was.

Good luck everyone!

- Liam

I apologise if I am overlooking a trick. However I am not able to get to a point where I can simply boot off the USB key. Are you able to outline the steps undertaken to create the key. My machine looks to operate in a loop then eventually boot of the present installed OS (which I plan to flatten).

Thank you in advance for your assistance.

Please ignore my post I have seen the error of my ways.

Thank you AC1K Great post now my brain has kicked into gear. :)

Please does anyone has a complete bios dump for the model Latitude E7240. Thank You very much.

this was very help full for my dell e6540

I did just like this (mini modded):
1) removed
2) format the usb stick as FAT32
3) copy the bootx64.efi file into the flash drive under EFI\Boot\ -(http://brains.by/posts/bootx64.7z)-
4) UEFI boot off the drive (F12)
5) type in "setup_var 0x19D" (should return 0x0) << this is to check
6) type in "setup_var 0x19D 0x1"
7) type in "setup_var 0x19D" (should return 0x1) << this is to check
8) reboot and set your bios (if not set already) to RAID, then use CTRL + I to get into the Intel Raid setup, create your array, and off you go.

and set the bios to uefi , to boot properly, otherwise you will get invalid partition table.

Hi guys.
Thank you so much for the posts.
I was so excite when I see this thread. but I am not able to enter raid menu after setup_var 0x19d 1.
I think maybe because I am using BIOS version A25. I tried to us ftpw64 to dump the bios but failed. first time with command fptw64 -D back.bin -BIOS. it gives no errno. but I cannot find the file. second time it will show error 366.
many thanks in advance if anyone can help
Regards
===============update==============
after reflash official BIOS. and setup_var 0x19D 1 again.
it works!!!
thank you guys so much.

I am using BIOS A25.
I will resetup the OS then test the performance.

Hello. I have a Dell Latitude E6440, bought a HDD CADDY and have two identical SSD's - 2*120 GB WD Green. I would like to use them in RAID 0, from where can I get the .efi file. Part 1 is ok, I take a usb stick(can be bigger then 1GB?) and format it to fat32. So far I got it. I need to create a folder on the usb stick and name it EFI\Boot\? Can you please be kind to assist me, I would really appreciate it.

@allein the link in post @39 still works, and contains the file you are looking for
You need folder EFI at the root of the USB (Not in any folders), then inside that folder BOOT, then inside that put the efi file - this = EFI\Boot\ then file inside here.

I will take a look, thank you.

I have formated the usb stick to fat32, created a folder name EFI, within this folder I have created a new folder named Boot and copied the efi file in folder Boot.After reboot I hit F12, select the usb stick from UEFI BOOT and for a moment (fem ms.) it pops up a message saying error, afterwards I seea black screen and is shows:

grub - I type in here "setup_var 0xD19", hit enter and it shows error - cant find command 'setup_var 0xD19'. I had Bios VS. 21, made a downgrade to V. 18. It doesnt work, what is that I am doing wrong?

Is maybe some BIOS setup that I need to do? UEFI is ON.

I will try to flash the BIOS and will see what happens afterwards. Could be the problem that win10 is already installed on one of the SSD drive?

It works, I have entered the command with "" thank you for your help. I will update you if there is any change using the 2 ssd drives in raid0 in comparation with just 1 ssd.