Mixed up cables of powersupply killed 14TB of storage

[Fisherp93]

installed wrong psu cables when rebuilding nas and may have killed 14TB of storage luckily nothing important was on the drives question is are the drives dead dead?

[Chronified]

PSU should've tripped from a ground-short before it destroyed your drives, I say there's a 95% chance the drives are all fine given it's a reputable PSU 

[Elisis]

17 minutes ago, Chronified said:

PSU should've tripped from a ground-short before it destroyed your drives

No? There is zero guarantee of that, especially if 12v is sent to ground and vice versa. Or 12v is sent to 5v. 

[Spotty]

The controller board on the HDDs are likely dead. If you're lucky it might have just blown a fuse on the board. It's possible the data on the drives can be recovered by a data recovery service.

[mariushm]

Not even that.

There's usually some protection diodes on the input (on 12v and 5v) and those blow up often. Then, you may have fuses ... and worst case scenario if you somehow pushed 12v into 5v, you maybe blew the controller chip (in which case you could transplant a chip from a similar drive to fix yours...  or replace the whole circuit board (but switch the eeprom chips with drive information between the circuit boards)