Why is the 500GB hard disk have less than 466 GB?

Hard Disk Drive

This was a question that one of my friends asks me after buying a new 500 GB Hard Disk. I really didn’t ask that question to myself. So, I couldn’t answer that instantly. After a few days of information searching I realize the truth. So, here I’m going bring the facts the way I told my friend.

  • All Hard Disk manufacturer way of counting space is different from the way a software count a space. This means to a Hard Disk Manufacturer, 1GB is 1000 MB, 1 MB is 1000 KB and so on.
  • Software or computer language recognize a space in terms of power of 2 say \(2^1\), \(2^2\), \(2^3\) etc. hence a KB is \(2^{10}\) Bytes which is 1024 Bytes.
  • Lets do a little math:

From a Manufacturer a 500 GB hard disk is 500 x 1000 x 1000 x 1000 = 500,000,000,000 Bytes

From the Computer Language point of view a 500,000,000,000 Bytes is: 

\[\frac{500,000,000,000}{1024*1024*1024} = 465.66 \text{ GB}\]

Now you’ll see why your 500GB hard disk has only less than 466 GB space in total. Well if you go with higher space like 1 TB and so on the space missing is increasing. You do the math. I cant do the math well for higher no.

The question is why did manufacturer cheat us? Everybody is cheated, when will this be corrected. I guess not soon.



F Diengdoh.com: Why is the 500GB hard disk have less than 466 GB?
Why is the 500GB hard disk have less than 466 GB?
Hard Disk Drive space, the manufacturers and the computer point of view. Why is it that we always see less space in any given hard disk
F Diengdoh.com
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