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I have a computer that dual boots Windows 10 and 11. Windows 10 was installed first on a SATA SSD, while Windows 11 was installed afterwards to a separate M.2 SSD. Now that I've been on Windows 11 for a while, I want to wipe that the Windows 10 drive and use it elsewhere. However, if I unplug the Windows 10 drive my PC fails to boot past the BIOS. The Disk Management tool shows that my EFI System Partition is on the Windows 10 drive, meaning my Windows 11 install cannot boot without the Windows 10 drive.

How do I break this dependency so I can boot off my Windows 11 drive when my Windows 10 drive is disconnected?

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Stevoisiak
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  • Shrink the Windows partition and recreate the EFI partition on the unallocated space that is created – Ramhound Aug 31 '23 at 00:48
  • Something like [this](https://www.tenforums.com/installation-upgrade/52837-moving-recreating-efi-partition.html#) should help – Ramhound Aug 31 '23 at 00:55
  • I didn’t intend to unilaterally close this question, the duplicate doe’s explain, what must be done. There is probably a better duplicate though – Ramhound Aug 31 '23 at 01:11
  • The linked duplicate says how to resize an EFI partition, but not how to transfer one. – Stevoisiak Aug 31 '23 at 02:16
  • The answer I read explains how to create a 500 MB EFI partition which is exactly what you need. – Ramhound Aug 31 '23 at 02:35

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