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Long time ago, I had a Windows 7 installation on a 128Gb SSD.

I then upgraded to Windows 10 on a brand new 256Gb SSD.

I kept it as this for a while, but now I need my SATA socket to connect a new HDD.

But if I disconnect my Win7 SSD, the computer won't boot : I get to the UEFI BIOS screen, then I have either a black screen with the white cursor blinking, or the message telling me to insert a bootable drive. This happen if I don't touch the BIOS, but also if I select manually the win10 SSD.

Then, whenever I connect my win7 SSD, the computer will boot normally, whether I connect it by SATA or by USB 3.0 with an external box (which is totally weird to me).

In the BIOS, the boot order is : Win10 SSD only (the Win7 is not even mentionned)

In the partition manager, there are :

  • Disk 1 : Win10 (healthy: exchange file, empty if trouble, main partition) and Unnamed (healthy: recuperation partition)
  • Disk 2 : System reserved (healthy: System, active, main partition) ans Win7 (healthy: main partition)

How can I get rid of my win 7 SSD ?
(If you can explain what's going on this would be very interesting !)

Dan Chaltiel
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1 Answers1

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There is absolutely no need to reinstall, as found in an answer to System Reserved partition on wrong drive - how do I move it?.

1) Open a command prompt as admin, then type the following:

bcdboot C:\windows /s C:

Hit Enter.

This command places boot files on the C: partition which is your windows.

2) Now open disk management, right click C: and click Mark active. Right click System reserved and click Mark Inactive (unless its already showing inactive).

I couldn't mark the System reserved partition inactive (there was no option to), but it worked anyway.

Ramhound
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Dan Chaltiel
  • 185