Question Sata and HDDS keep getting fried

[mtm5062]

I am doing a simple case swap for a friend. The good thing is I have a ton of used HDDs and SSDs. So far I have fried 3 SSDs and 3 HDDS. 1 HDD legit caught on fire. The crazy thing is if I take a new SSD it works fine and lets me load Windows. Once I go to add an addition HDD for more storage it fries both. What can cause this? I am running out of hard drives to test.

 

[SkyNetRising]

Once I go to add an addition HDD for more storage it fries both. What can cause this?

Modular power supply with wrong (incompatible) modular cables.
This can certainly damage/kill your HDDs/SSDs.

Modular PSU cables are not compatible between different PSU models.

 

[logainofhades]

Poor quality power supply can cause this.

 

[Misgar]

I'm surprised you didn't stop after the first drive died. "Roll another cheese down the hill to find the first one"?

Get a cheap ATX PSU tester and check all the SATA and Molex power connectors for correct polarity. If a +12V wire is connected to the +5V or +3.3V rails due to a wiring error, magic smoke will appear.

For example, when you plug a SATA connector into the tester on its own, you should also see the appropriate voltage displayed under +12V1 or V2, +5V and +3.3V. If you see +5V under +12V and +12V under +5V, you know the wires are crossed.

https://www.amazon.com/Computer-PC-Tester-Connectors-Enclosure/dp/B076CLNPPK

One time, I noticed the +12V and +5V wires were crossed over in a Molex splitter cable, due to a manufacturing fault. It could've fried an optical drive or PATA hard disk.