Why HDD shows less size than mentioned?

  sanjoo 14:14 19 Dec 2005

Hi all,

I brought 40 GB HDD. When i load OS and then i tried to see the size using my computer. But it shows some thing less than 40 GB. When i contacted company about this. They said it calculates on 1000 intead 1024 base. Can any one explain this? Please help me to get clarify this as it sounds technical question?


  stalion 14:20 19 Dec 2005

this is normal what reading are you getting info here click here

  Devil Fish 14:22 19 Dec 2005

This may give you more insight click here

  pauldonovan 14:23 19 Dec 2005

..Your operating system takes up some space (quite a bit probably) on it. I believe the disk is also used to store information about what is on the disk - like an index if you like, which will use up more space. Some manufactureres I think might use 1000 to round for convenience but should make this clear really to be fair.

  Totally-braindead 14:26 19 Dec 2005

Its normal, its the way hard drive manufacturers calculate using 1000 megs to the gig rather than 1024 megs to the gig. stalions link explains all.

  sanjoo 14:33 19 Dec 2005

Hi all,

Thanks for prompt responses. But everything looks close enough. But didn't given me total crystal clear answer? Can any one please explain?


  BurrWalnut 14:43 19 Dec 2005

1,024 bytes (2 to the power of 10) is referred to as 1Kb.

1,048,576 bytes is 1Mb.

So, 1Gb is not 1 billion (1,000,000,000) but 1024 * 1024 * 1024 (1,073,741,824).

Now divide your quoted HDD size, say, 60Gb by the above figure and you get 55.87Gb showing as the HDD size.

  rupie 14:46 19 Dec 2005

computers work in base 16 decimal is base 10. decimal goes 1, 10,100, 1000

base 16 goes 1, 16, 64, 1024 It harkes back to the very origins of computer technology. the old 8 chips dealt with 8 zeros and 1s eg 10010101 at once and now the new 64 bit chips deal with 64bits. 1024 bits make a byte and so on up to 1024 meg are 1 gigabyte. This may be slightly incorrect but I am having to remember my old 'A' level computrer studies.

  BurrWalnut 14:46 19 Dec 2005

Sorry, my example quoted a 60Gb and yours is a 40Gb which translates to 37.25Gb.

  sanjoo 14:56 19 Dec 2005

Hi all,

Wow, great it give me broad idea.
Thank you one and all.


  BurrWalnut 14:58 19 Dec 2005

You are 'slightly' incorrect. You're confusing binary with hexadecimal.

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