[hiiamhasan]

Hi
My question is what will happen if try to plug the power cable to hard disk in reverse ?(means 12V - 5V in reverse order)

 

[Aus_Karlos]

Welcome to TSF,

The design of the 4 pin Modular plug and the thin SATA power cable prevents you from doing so. The 4 pin is smaller at the top and larger at the bottom, while the SATA has an elbow at one end.

 

[hiiamhasan]

SATA Hard Drive Adapter for USB 2.0

I used this system but it is burnt my hdd.
Is that cause change the 12V -5V ?

 

[Aus_Karlos]

Even looking at the websites images you can see that each connector is the standard 4 pin modular connector and an adapter from the 4pin to the SATA connection. There is no way you reversed the connection it wouldn't physically fit.
Did you have the HDD resting on something?
If its a standard HDD not in an enclose it has an exposed PCB if something metallic was to touch the board and made contact it can short out the PCB. Or you placed it on a fabric material that had a static charge.

 

[hiiamhasan]

I saw the smoke on HDD.
Want I change the entire PCB ?

 

[Aus_Karlos]

If that's the case then its possible the HDD has been destroyed. You can't change the PCB yourself. If the data is intact still on the HDD platters you will need to send it off to HDD experts that have a clean room where they will take apart the HDD and place the platters into a working PCB case and recover the data.

 

[hiiamhasan]

Thank you so much

 

[DataMedics]

Actually it might have just burned a TVS diode on the PCB in which case you might be able to still recover the data yourself.

What brand/model of hdd is it? And can you provide a picture of the PCB (the side with all the chips on it)?

 

[hiiamhasan]

I will send shortly

 

[hiiamhasan]

Imgur: The most awesome images on the Internet
here is brand and PCB

 

[DataMedics]

I've circled in red the TVS diodes:

Test them both using a multimeter to see if they are short circuited. If either of them are, you can simply remove them and the drive may work again. Just be sure you are on a very clean power supply (and preferably a UPS) when you run the drive, and immediately backup the data as the drive will have no over-voltage protection so any power surge can kill it.

 

[hiiamhasan]

if we change the diode, will the hard disc work continuously?

 

[DataMedics]

It could. I personally don't ever trust a drive that's been repaired. I actually don't trust any drive at all though given how many failed ones I see each week. That or you can just replace the PCB with a new one. These Samsung drives don't have an adaptive ROM in the PCB so you can just cold replace it. Just match the following specs:

Model Number
Code Imprinted on underside of PCB starting with BF41
Firmware (if you see it on the label)

And it should just work.