Windows 10: Diskpart assign letter "survive" after reboot

Hello,

I don't understand.

I am in a Win PE, or in another kind of recovery tool with command line.

I do:

diskpart
sel vol 1
assign letter=z

now "Z" is assigned to a disk.

I REBOOT the computer and operate with another recovery tool (i.e. Macrium).

I go to the promt and that disk is still mounted with a letter (generally C*Smile.

But If I load a regular OS (Win 10) every letter is OK.

How the assigned letter of DISKPART "survive" if the assign is done OUTSIDE the OS?

:)

 

Windows 10 upgrade consistently fails at 24% (installing from USB created with the 'creation tool')

This is the best explication of rebuilding the BCD on an EFI system partition that I can find:

Back up your files or save a backup image of your install now.

Go into the Advanced options and run the Command Prompt.

Enter diskpart to use the DiskPart tool to ensure you have all the right partitions and to identify your EFI partition - the key thing here is that your EFI partition is formatted as FAT32:

Then assign a drive letter to the EFI partition:

Exit DiskPart tool by entering exit and at the command prompt run the following:

Delete or rename the BCD file:

Use bcdboot.exe to recreate BCD store:

The /f ALL parameter updates the BIOS settings including UEFI firmware/NVRAM, /l en-gb is to localise for UK/GB locale. The localisation defaults to US English, or use en-US.

Reboot and cross your fingers.

Source

 

Error code after update File:\EFI\Microsoft\Boot BCD Error Code 0xc0000185 BSOD

Insert windows 10 bootable DVD or USB and go to installation.

• Choose 'Repair Your Computer'.
• Choose 'Troubleshooting'.
• Choose "Advanced Options'.
• Next choose 'Command Prompt'.

Next, Use the
DISKPART tool to verify that the UEFI partition has a drive letter assignment.

Enter 'DISKPART' (Enter)

(In this test case we removed all other drives except the boot HDD and DVD, so we know the disk 0 is our boot HDD)

DISKPART> sel disk 0

Disk 0 is now the selected disk.

DISKPART> list vol



There was no drive letter assignment to our UEFI partition (volume 3) so you need to assign a drive letter.

DISKPART> sel vol 3

Volume 3 is the selected volume.

1-If you know that you have a extra drive letter available use it here, otherwise skip to 2.

DISKPART> assign letter=E:

2-If you are unsure what the drive chain is or if you don't know what drive letters are avalable use:

DISKPART> assign

If all went well, DiskPart successfully assigned the drive letter or mount point. You can verify that a drive letter was assigned by "DISKPART> list vol" again.

Exit DiskPart tool (Enter EXIT)

Next, we need to change to the boot folder on the UEFI volume.

Change to the UEFI volume into the boot folder. Use drive E: here or whatever drive letter was assigned above.

cd /d E:\Boot\

We need to enter three command lines to repair the BCD store.

For MBR drives: (Drives < 1TB)

• bootrec /fixboot
• bootrec /fixmbr
• bootrec /rebuildmbr

For GPT drives: (Drives > 1TB)

• bootrec /fixboot
• bootrec /rebuildbcd

 

You can't. Each OS assigns drive letters when it loads. And recovery/rescue drives that load from USB or DVD typically don't even save drive letter assignments to the USB or DVD so if you have a different physical arrangement of the drives when you boot into them the drive letters might even change then even though you are using the same rescue/recovery OS.

 

Weird. I was not ask if that is possible.
I was ask WHY in my system they SURVIVE!!!
Not in the win10 os, they survive in the various tool that i use (win pe, macrium, etc).
Its so strange!!!