What will happen to the HDD if + 12V gets on all SATA lines?

Question

Hard disks

I bought a replacement power supply from the same company, it also uses a modular wire connection. I replaced, but did not remove the pigtail of the SATA drives, left it from the previous PSU. As a result, the screws died, except for the SSD.
Later I checked the cable pinout and it turns out that the new PSU (of the same popular company) has a different pinout! Instead of 3.3V and 5V, I got 12V.
The question is, how bad is it? I was told that it can not be repaired, but the data can be drained for a lot of money.

Answer 1

Maybe it's not all that bleak. It is worth looking visually at the board, there is often a protective diode or fuse at the input, it may have burned out. Or a zener diode at the input, check that it does not short to ground. Those. possible repair is quick and cheap.
There is an option to buy / find a board from exactly the same disk, solder the FLASH memory with calibrations from the old disk (if it is still alive) to a new one and try to start it. There is a chance it will take off.

Answer 2

If 12 V really gets on all lines (including the common wire), then absolutely nothing will happen.
If 12 V gets on the data lines, then most likely nothing will happen either. The SATA data lines are DC isolated.
Well, it's hard to believe that the Chinese could mess up like that ...
PS What about the first paragraph from Grigory Boev 's answer ?

Answer 3

Well, it's hard to believe that the Chinese could screw up like that ...

Somehow a friend burned the hdd in a similar way. Everyone's first reaction is like in a joke about "the strong won", but as it turned out - not at all. BP from eminent.