How to repair a damaged partition on a data drive?

My main desktop (running Windows 10 version 2004 19041.685) computer has a StarTech hotswap trayless rack that I've used for years:

I have a number of bare hard drives that I use to backup and to store offline data; I put one of my offline data drives in which I'd used a month or so ago and something appears to be wrong and the partition must be damaged in some way because Windows says it's "5588.90 GB RAW Healthy (Basic Data Partition)":

I've tested the drive using the Western Digital Diagnostics and it passes both the SMART and short DST tests and the drive does not appear to have any problems but there's no partition data. Is there any way to repair or recover the damaged partition and files? I've googled but almost all results are about a "Recovery Partition".

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Windows disk manager doesn't show all partitions. As mentioned, use MiniTool Partition Wizard free.

Follow jumanji instructions. He is the Disk Guru.

jumanji said:

Hi @NormAtHome,
It is not a partition lost. How many partitions did you have?
As far as I see, a partition exists and it has a drive letter G: ( Only when a volume is created one can assign a drive letter. When you create a volume, a partition table is wriiten in either Sector 0 ( MBR Disk) or sector 2 ( GPT Disk)
If you have MiniTool Partition Wizard free installed, just examine the disk with it. It may show a partition G: and as "unformatted"
This is due to file System corruption. ( Volume/Partition Boot sector corrupted or MFT corrupted. We may have to decide which one)
Without further ado, please read my post here
Harddisk is RAW and post screenshot 5 and 6 of TestDisk. ( Note: Select your faulty 6GB disk in screen 2 and in screen 3, Select [EFI GPT] and not [Intel] and press Enter to go to the 4th Screen)
Screen 1: [No Log] Enter.
Screen 2: In your case you will select 6GB faulty drive. [Proceed] Enter
Screen 3: [EFI GPT] Enter
Screen 4: [Advanced] - Filesystem utils - Enter. ( ya, we are much advanced )
Screen 5: Does it show your partition? Is [Boot] highlighted? Take a screenshot and then press Enter
Screen 6: Shows the status of the Volume/Partition Boot Sector and its backup. Take a screenshot
Quit TestDisk.
Post screen 5 and screen 6
We can proceed further only after examining the screenshots.
[You may also read my post here
WD Elements being read as RAW // Contents readable through app - Windows 7 Help Forums
You will only be going upto Screen 6, post screen 5 and screen 6 and then quit TestDisk. Do not overshoot]

Here are the screen shots:

my 2 cents...

partition recovery software recovers partition but makes files corrupt from raw drives. reclaime pro is best option for file recovery... if it continues to count errors after errors, you have a bad drive. drive controller?? check event viewer. seagate seatools (boot usb i think. unsure if capable of raw support) can help.

it changed to raw, it will do it again. the drive is bad. recover your files with reclaime pro, then screw around testing it later.

mrpink said:

my 2 cents...

partition recovery software recovers partition but makes files corrupt from raw drives. reclaime pro is best option for file recovery... if it continues to count errors after errors, you have a bad drive. drive controller?? check event viewer. seagate seatools (boot usb i think. unsure if capable of raw support) can help.

it changed to raw, it will do it again. the drive is bad. recover your files with reclaime pro, then screw around testing it later.

Hi mrpink, Welcome to Ten Forums.

Please Keep your 2 cents with you .
1. Here we are not attempting Partition Recovery.
2. Also your statement that "partition recovery software recovers partition but makes files corrupt from raw drives" is not true.
3. Your stätement "it changed to raw, it will do it again" is also not true.

I have to repudiate these statements lest other people get misled.

jumanji said:

Hi mrpink, Welcome to Ten Forums.

Please Keep your 2 cents with you .
1. Here we are not attempting Partition Recovery.
2. Also your statement that "partition recovery software recovers partition but makes files corrupt from raw drives" is not true.
3. Your stätement "it changed to raw, it will do it again" is also not true.

do you know what my 2 cents means? it means my opinion is only worth 2 cents... please keep your smiley with you.
1. your post didn't appear to be relevant to ops problem.
2. DIRECTLY from experience. after using partition recovery on a raw drive, my files became corrupt.
3. absolutely happened to me again. same drive. bad controller.

i hope op doesn't lose his data and his drive. thats the goal. good luck to op.