Hey guys, I don't know where else to look for a solution, so I decided to ask to the experts.

I have an external case for 3.5-inch SATA drives, and a Seagate 1tb SATA disk.

At first the disk worked perfect, could access its directories, files, etc.

The problem arose when I wanted to format it ... in the middle of the process the format froze and I had to disconnect it. From that moment on, the disk is no longer recognized.

I have tried the case with another disk and it works, so it is undoubtedly the disk.

In windows I have tried all kinds of tutorials out there, but the disk dosen't appear.. nor in the windows disk management, or running the 'diskpart' followed by the 'list disk' command. In fact, when I plug the usb Windows says that "USB device not recognized"... as I said, with other disks, the external case works perfectly.

I have tried on pc and mac.

The disk when connected does not seems to have any "physical" problem since it makes no strange noise and it shows that it is working (common hdd sound).

I have no interest in recovering the info, I just want the OS to recognize it so I can format it and use it.

Does anyone have any clue as to what could have happened?

Any help is very welcome.

My guess drive has bad sector. And probably heads gone now.
Seagate=headache

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A Recovery Service In Turkey . Veri Kurtarma Türkiye https://www.digitalverikurtarma.com
Donor Drives hdddonormarket.com

Would suggest checking SMART attributes.
Could use CrystalDiskInfo or HDDScan, or both to confirm results from each.

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Hard Disk Drive, SSD, USB Drive and RAID Data Recovery Specialist in Massachusetts

I cannot manage to use CrystalDiskInfo or HDDScan because the PC doesn't even recognized the disk on the external case.. it says "USB device not recognized" so the disk doesn't even appear on the 'choose disk' dropdowns

Time to move on then. It is not reliable for further use.

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Hard Disk Drive, SSD, USB Drive and RAID Data Recovery Specialist in Massachusetts

I was going to recommend HDD low level format, however, I think the previous poster is correct. HDD LLF can overcome logical failure, probably not a physical failure.

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"Take care of thy backups and thy restores shall take care of thee." Ben Franklin revisited