Bitlocker encrypted disk suddenly disappeared

Question

Hello microsoft community,
i've navigating through google in the past 4 days searching for a similar situations for my case but got no luck finding any..
The problem happened after trying to recover some data using a cmd based recovery program called test disk, i wasn't able to recover any of my deleted files and everything was okey until i shutdown my pc, after the shutdown i came back in the next day finding that my D: partition is disappeared.
Methods i tried to resolve the issue:-

1. tried assigning a volume letter manually using computer management

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](https://learn-attachment.microsoft.com/api/attachments/55aedca9-9fbd-4e81-9048-f82e928b290a?platform=QnA"2">

restarted my pc and tried using a method that i've seen in a topic opened here which is using disk part > setid=07 override

but nothing happend.

3. tried to decrypt the disk using manage-bde command but i kept receiving an error which is invalid parameter.

The problem is all my work is saved to that encrypted disk, i have no extra backup so it would be great if i resolve my problem.

Thanks in advance!

Note: am using windows 11 with AMD tpm, the disk is encrypted using bitlocker

Question has been also asked here:- https://answers.microsoft.com/en-us/windows/forum/all/bitlocker-encrypted-disk-suddenly-disappeared/7844875e-e96c-452b-aa51-43b6f790d8f9