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Hi, it worked! I removed the casing and connected the drive to my desktop computer and ran TestDisk. Quicksearch was executed without errors and I could write new partition table. All of my files are safe and sound .
Thank you very much for your help!

Once again, huge thanks for your help!
I'll definitely go with the "removing the disk from its enclosure and running it directly in a desktop computer" option because right now CrystalDisk doesn't even see the disk. If it reads anything I'll come back with new information.

Ok, I feel stupid now :)
This is what I get after correcting the command

C:\Program Files\smartmontools\bin>smartctl -s on -d ata -a /dev/sdb
smartctl 7.5 2025-04-30 r5714 [x86_64-w64-mingw32-w11-24H2] (AppVeyor)
Copyright (C) 2002-25, Bruce Allen, Christian Franke, www.smartmontools.org ...

Ok, I have it... sort of. I had problems with connecting to the disk, but I've found right command for usb drive. Now I don't know how to enable smart support

C:\Program Files\smartmontools\bin>smartctl -d ata -a /dev/sdb
smartctl 7.5 2025-04-30 r5714 [x86_64-w64-mingw32-w11-24H2] (AppVeyor ...

Hi, thank you for your reply.
I'm running it with right click and "run as administrator". Isn't this enough?

Hi everyone,
I've accidentally deleted a partition on my external HDD drive using Windows Disk Management tool. I'm trying to recover partition using TestDisk, but without success. When I run quicksearch in TestDisk it last only couple of seconds and goes up to 99%, and stays like that. After I stop ...