Why my 320 GB HDD is only 298 GB

Did you ever wonder that you had bought a 120 GB HDD but the computer showed it as a 111 GB HDD. And where did the rest of the space eventually disappear? Well nothing disappeared and even the manufacturer didnt make a fool of you.

This happens because there is a slight difference between the way the computer and the manufacturer calculate the HDD size.

One GB according to Computer Science Terminology

8bit = 1 Byte

1024 Bytes = 1 Kbyte

1024 KBytes=1MByte

1024 Mbytes=1GByte

One GB according to Manufacturers

8bit = 1 Byte

1000 Bytes = 1 Kbyte

1000 KBytes=1MByte

1000 Mbytes=1GByte

Theoretical Value

Practically what we get

1 GB

0.931 GgB

10 GB

9.31 GB

20 GB

18.62 GB

40 GB

37.25 GB

80 GB

74.50 GB

120 GB

111.75 GB

160 GB

149.01 GB

250 GB

232.83 GB

320 GB

298.02 GB

500 GB

465.66 GB

A we see that greater the hard drive size the larger is the number of missing GBs…

The manufacturers state that they call one GB as 109 and not 1024x1024x1024


Author: MtaraM

Solution designer with Firstsource solutions. An MBA grad in Networks and IT Infrastructure. Technology enthusiast, blogger, webdesigner, Network security aspirant and in love with electronics and gadgets a Household Hacker and Audiophile who loves to share thoughts about almost anything @Mtaram on Twitter

2 thoughts on “Why my 320 GB HDD is only 298 GB”

  1. @mtaram .. does this happen on Linux platform too? I was under the impression that this happens only on the Windows platform.

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