Hard Disk Drive Activity metre

Here i had been working on this project for a long time and finally i was able to compile a working version of the HDD activity meter. The project that i will be showing, is fully tested and working. In fact i have installed in my computer and those interested and who want to have unique gadgets, this is the best project for you all.
This is also a unique project as because which searching in the search engine of instructables i could find none.
The project is quite a simple one and any one who can read schematics can easily assemble one from scratches. What this gadget does is that it tells the activity of the hard drive. In a company enclosed PC there is only one LED given to show the status of the hard drive, but now through this project you can have about 10 LED's to show the activity of the Hard Drive.
And each of the LED's have independent control over the other. So lets start by selecting what are the raw materials needed.

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Step 1: Materials Needed

• PCB board, (can be of any type).
• 10 LED’s whatever color you may use.
• IC- LM3915 or LM3914
• Optocoupler CNY17
• CAPACITOR
4.7uF/16V
• RESISTANT
10K POT type (Variable)
2.5K POT type (Variable)
1K ¼ watt
1.2K ¼ watt
3.9K ¼ watt

This are the primary things that you need to complete the working PCB and how you are gonna enclose the whole board completely lies on your ingenuity and skillful thinking.
For me I enclosed some of the LED’s using neon lighting technique and some I just drilled straight to the enclosure of my PC. You can see a video given in this instructables.
Actually I tried with the two versions trying to get the better position of the LED’s and I am showing both the position in the video. This is my first Version.