Retrieve data from a Hard Disk That was connected to the optical Drive of Mac Book pro

Hi Experts
I have been using a Mac Book pro from 2011 (Early 2011 Model), In the mid of 2012 I have planned to upgrade, and bought a 240 GB SSD and 16 GB ram from OWC, Installed successfully and bought another 750 GB WD Sata Disk and connected it to the Optical Drive Bay of the Laptop, using the optical drive as an external device now
I was using the SSD as the main disk for all the applications and OS itself, and tranferred all the user library (iTunes Library, iPhoto Library, Documents etc..) to the additinal 750 SATA Disk,
Last week the Mag Safe cable has been worn out and seperated completely from the adapter, I tried soldering the cable again and it was working for two days, third day The machine stopped charging and it was working until the battery run out of charge,
Now I have bought a new Mag Safe Charger for 108 Singapore Dollars and it wont charge, read in iFixit Forums to change the Mag Safe DC in Board, so found a new part in singapore and replaced DC in Board myself, after doing this when I connected the new mag safe adapter, it fired the cpu fan for two second, I was able to see the green light the adapter and it stopped again and the green light wont lit up now
Removed the logic board from Laptop completely and tried connecting the Mag Safe Adapter I can see the green light,
So with all the above details, Iam confused whether its the Logic Board or the Battery that is giving me issue, I can find out the problem by contacting a Authorised service centre, but Iam thinking whether its is worth to repair it or buy a New Mac Book Pro ?, Because if I need to change the logic Board need to spend 900 Dollars + 100 dollar service charge
So I was trying to remove the 750 GB WD Sata Disk to see if I can get the data back so I can buy a new Laptop without worrying,
The real issue now is when I connect the 750 WD Disk using a sata to usb converter cable to my official macbook, it says the connected USB device is drawing more power than expected and it wont even detect the hard disk, Iam wondering why it cannot detect the hard disk even in the disk utility, is there any way to get the data back from the 750 GB WD Sata disk (which was connected to the Optical Drive Bay)
Your expert advice is much appreciated
Regards
Vinodh

Welcome to the discussions!
It sounds as if your disk was not correctly formatted to work with the Mac operating system. I suspect it was formatted in FAT32, which is primarily a Windows format. This type of format will not allow the disk to accept any files larger than 4GB. That's probably why you are seeing the crashes.
Connect the drive to your Mac and open Applications > Utilities > Airport Utility.
Click your disk on the left and click the erase tab on the right. You need to format the drive in +Mac OS Extended (Journaled)+. Formatting will erase everything on the disk.
Then you could try the drive again attached to your AirPort Extreme to see if that will do what you want.

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