A company laptop unexpectedly lost its Entra and Intune enrollment. I was able to restore the device record and retrieve the BitLocker recovery key, but the machine now only shows an unknown local admin account at sign-in. Resetting Windows repeatedly failed, even after using the recovery key, and the Windows 11 installer could not see the internal drive. Hirens BootCD also failed to access the encrypted disk. I eventually discovered that the BIOS storage mode was set to RAID instead of AHCI. Has anyone else run into this, and what is the correct way to recover or reinstall the system?
4 Answers
The unknown admin account is probably unrelated to the drive visibility problem. A device can lose its management enrollment while still retaining local account and policy issues. If the data is not needed, a clean installation is usually simpler than trying to repair the old enrollment or recover the local administrator account.
If the goal is simply to erase the machine and reinstall Windows, BitLocker should not prevent that. Boot from the Windows installer, open Command Prompt, use DiskPart to select the internal disk and run clean, then refresh the drive list and install to the unallocated space. Be absolutely certain you select the correct disk, since clean destroys all data.
Before wiping anything, confirm the device is still properly recorded in your organization’s management systems and preserve the recovery information. If the machine is managed through Autopilot or another deployment service, check that record too. Once the storage controller is configured correctly, you can reinstall and enroll the laptop again.
On many business laptops, especially Dell systems, the installer will not see the NVMe drive when the controller is configured for RAID or Intel storage acceleration without the matching driver. Switching the BIOS storage setting from RAID to AHCI made the drive appear normally for a clean Windows installation.
This was the fix. I changed the BIOS setting from RAID to AHCI, and the drive became available so I could proceed with the reinstall.
That was the approach I was trying, but the internal drive was not visible to the installer. The issue turned out to be the BIOS storage mode rather than BitLocker.