Windows 10 Windows 10 boots only from old SSD

livix07

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Feb 19, 2018

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585

• Jan 26, 2019

• #2

As far as I can see you have 4 disks.
Is that correct?
If YES, then disconnect all the other disks except the new SSD, restart computer and see what happens.
But I don't see any EFI partition on your new disk. In this case you should change to legacy BIOS in the BIOS settings.

 

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A

AlexP11223

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Jan 26, 2019

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• Jan 26, 2019

• Thread Author
• #3

It will probably not work because when I select the new SSD in boot menu I get error saying to insert a bootable device (not sure why it does not just boot from the next bootable device as specified by boot order ¯\(ツ)/¯, Asrock Z390).

I tried EasyBCD but I get error

An attempt was made to change the boot partition to a logical drive, which is not allowed. The boot partition must be a primary partition.
Please either select a different drive or convert the selected partition to primary first, then try again.

Click to expand...

even though it is a primary partition. Also tried adding 500MB partition on this drive, the same result.

 

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livix07

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585

• Jan 26, 2019

• #4

AlexP11223 said:

It will probably not work because when I select the new SSD in boot menu I get error saying to insert a bootable device (not sure why it does not just boot from the next bootable device as specified by boot order ¯\(ツ)/¯, Asrock Z390).

Click to expand...

Alex, if there is no EFI partition on your new disk then it will not boot unless you change from UEFI to legacy BIOS.
Anyway, if I were you I would disconnect all the other disks and reinstall Windows (reformat) the new SSD. Especially if you don't have much data on it to back up.

 

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Neemobeer

Cloud Security Engineer

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8,998

• Jan 26, 2019

• #5

You'd need to create a EFI system partition and then copy boot files to it to work. Microsoft recommends it be the first partition but it isn't required.

• Open an elevated command prompt
• Type diskpart
• Type list disk you should be able to ID which SSD disk is by it's size
• select disk # where # is the number from the last step
• create part efi size=500
• Type list part again ID the partition by the size
• select part #
• Type format fs=fat32 quick
• Type assign letter=z (replace z with any available drive letter)
• Type exit

Now assuming you picked the letter z and your active operating system is on C type
bcdboot C:\Windows /s z: /f EFI

Now reboot and select the new drive

 

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AlexP11223

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• Jan 26, 2019

• Thread Author
• #6

format fs=fat32 quick did not work but I earlier created another partition using

create part primary size=500
assign letter=W
format fs=fat32 quick
and
bcdboot C:\Windows /s W: /f ALL

so looks like it finally works now when I disable all other drives in UEFI (SATA ports in Storage configuration) and boot just from new SSD!

Also I used Minitool to remove letters from these drives, possibly can be done via diskpart like
select volume W:
remove letter=W

 

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Solution

Neemobeer

Cloud Security Engineer

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• Jan 26, 2019

• #7

If you want to still use the old SSD and don't plan on booting to it just delete the EFI partition and your UEFI firmware won't detect it as bootable.

 

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