I upgraded my PC drive to a new/faster SSD. I want to use the old drive as an emergency bootable drive in case my new drive has issues (which it currently does).
When I set the boot config in BIOS to boot to the external USB Thunderbolt device, I get BSD with Inacessible Drive error. I formatted my EFI partition to FAT32 and used BCDEDIT to create new BCD records, but wondering if the issues is the fact that the BCE records specify the partitions by drive letter. Yes, these are drive letters E: and F: now as I am booted into Disk 0. But when I boot into the External USB, won't these drives be different (i.e. the boot loader will be C:, not F:). So is this why I get Inaccessible error as it can't find E: or F: when booting into this External USB drive?
If so, what do I update the Device pararmeters to in the BCD to point to correct partitions when booting into this drive? I would think you'd have the Device specified as some Id that uniquely identifies the drive, not a relative drive Letter that changes.
Am I on the right path? :)


When I set the boot config in BIOS to boot to the external USB Thunderbolt device, I get BSD with Inacessible Drive error. I formatted my EFI partition to FAT32 and used BCDEDIT to create new BCD records, but wondering if the issues is the fact that the BCE records specify the partitions by drive letter. Yes, these are drive letters E: and F: now as I am booted into Disk 0. But when I boot into the External USB, won't these drives be different (i.e. the boot loader will be C:, not F:). So is this why I get Inaccessible error as it can't find E: or F: when booting into this External USB drive?
If so, what do I update the Device pararmeters to in the BCD to point to correct partitions when booting into this drive? I would think you'd have the Device specified as some Id that uniquely identifies the drive, not a relative drive Letter that changes.
Am I on the right path? :)


- Windows Build/Version
- Windows 11 Pro 22H2 10.0.22621.3593
Last edited:
My Computer
System One
-
- OS
- Windows 11 Pro, build: 22621
- Computer type
- Laptop
- Manufacturer/Model
- Dell 7620
- CPU
- Intel Core i7-12700H CPU @ 2300 Mhz
- Memory
- 32GB
- Graphics Card(s)
- Nvidia GeForce RTX 3060
- Hard Drives
- NVMe Samsung SSD 980 PRO 2TB