Firstly this is an easy less painful way to do this and it works 99% of the time.
Secondly if you do not know how to do this - DON'T, it can be an expensive screw up if you do not know what you're doing !!!
Thirdly we are going to slave your hard drive to another PC so we can format the drive. If you are unsure about how to slave the drive to another PC - DO NOT ATTEMPT THIS, GET A PROFESSIONAL TO HELP YOU.
Remove the left & right sides of your tower by removing the four screws at the back along the side of the panel
( all screws shown as red circles with lines in them ) The yellow circle highlights where the hard drive came from and there should be screws on both sides ( we hope )
This image shows the side panel off with the hard drive partially removed.
Pay attention to what goes where ( you will need to remember this later ) - Label the leads if needed.
Carefully unplug the leads from the back of the hard drive.
Now here is the important part, if you don't know how to set your drive as a slave - GET SOMEONE WHO CAN !!!
Pop your hard drive in another PC - by reversing the above process, and connecting the leads to your hard drive.
Now power up the PC with your hard drive in it and click the following...
Start ( bottom left hand corner of your screen )
My Computer ( opens up the panel of drives on the PC )
Right Click the Hard Drive you slaved to the PC
( you may want to check this is actually your drive, it will most likely show up as D - Drive or some other letter of the alphabet, and the main hard drive will show up as C ( easiest way to tell them apart is the icons are the same, one will be Labeled C and yours will be labeled D or some other letter.
When you are 200% sure this is your drive, right click on it and go down to FORMAT - this will wipe the entire drive clean - so double check this is the drive you want to format, you only get one shot at this, once it's gone, it's pretty much gone forever.
The format will take a reasonable amount of time, depending on what is on the drive ( how much space has been used ) but simply let the format run until it says completed.
Power down the PC, remove the hard drive - reset the pins from slave back to normal - and pop it back in your PC.
There are other ways of doing this, but i feel this is the most painless way.
If you find this helps, please take the time to rate the solution, thank you.
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