I didn't know this; I had foolishly assumed that SATA power connectors were standardized on both ends.
(I'm rarely smart and have a second big box of modular PSU cables that I maybe ought to get rid of.)
They're standardized on the device side, but not the PSU side. So always check pinout before you make the very reasonable assumption that if it fits it works
They had to make a post on r/hardware to get the brand to cover the damage, but IIRC, they never paid for data recovery services for the damaged HDDs.
I like Corsair because they at least mark the cable types on both ends; and while their PSU range vary in quality; none are trash -- Type-4 is Type-4 (or at least, I haven't heard of any reports of mislabelling on that front).
Especially if the "manufacturer" is just a reseller.
The motherboard cables do all kinds of different scary crossovers so never separate them, though you'll probably never have an "extra" motherboard cable in the first place.
None of the other cables bridge pins on the PSU side, they "just" scramble the pins they're attached to at the other end.
Visual inspection would normally catch situations like that, and then you might be able to figure out if it's okay with continuity checks and voltage checks with a multimeter on the relevant pints of the psu to see if those pins are different voltages... as long as the PSU powers the connector in the absence of load or sense pin signalling.
I picked out a random short ethernet cable that looked nice (it was flat) to connect my wifi AP to my router.
It took me about a month to realize my 100mbit internet connection had dropped down to about ~85-90mbit, but more importantly, transferring files between a wifi client and the wired network was also only ~90mbit.
Turned out the cable was so bad that it only connected at 100mbit...
I have now gone the other way and I actually curate the BBOC: All cables I get for 'free' with random appliances now go straight to the bin (unless they are specialised) and I only keep cables I specifically bought and know they adhere to a standard.
It's seriously annoying that this is the case though. Unless you kept the cables in the original package or in a labelled container, you cannot safely use them again if you owned more than one modular PSU.
On the bright side, the actual replacements that eventually got to me were both 2TB bigger than the originals. They didn't tell me about this, so I'm not sure if they silently upgraded me to apologize for the wait, it was an accident, or they happened to be out of stock and just grabbed the next size up.
6 pin EPS and 6 pin PCIe power cables are not the same. Even though the connector may fit they are not the same pinout.
Double uh oh.
One day I'll sort the box out. There's even SCART and PATA cables in there, as well as my old diskette holder.
...I should try and build myself a vintage PC sooner rather than later. Mind you, my dad got rid of all our old shareware diskettes years ago, unfortunately.