Lost Disk Space

  sibaw 10:30 05 Feb 04

I seem to have lost 2.73mgb of disk space?

I have a 40mgb hard drive, partitioned C & D, yet the disk manager shows total capacity of 34.18 on C and 3,09 on D, where did the 2,73 mgb go?

The free space is 26.16 on c and 2,22 on d, so I don't really miss the 2,73mgb - but where did it go?

  JerryJay 10:37 05 Feb 04

It is correct. Because GB in marketing is not GB in Computing. GB inm marketing = 1000MB, GB in computing = 1024MB, same as MB, 1000K in marketing and 1024K in computing, so 40GB is really 40/1.024/1.024 = 38.15GB even less if some part is used to store some recovery "disk".

  JerryJay 10:41 05 Feb 04

My calculation is not really correct yet:
1K=1000byte in marketing, 1K=1024 byte in computing. So 40 should be 40/1.024/1.024/1.024=37.25, so this figure is what you got. Fun?

  DieSse 12:20 05 Feb 04

"Because GB in marketing is not GB in Computing"

This is not correct.

Disk drive manufacturers decided some time ago to use the standard K = 1000 terminology - it's nothing to do with marketing.

See this interesting discussion from a relevant Standards authority. click here

  tafoody 12:22 05 Feb 04

divide the manufactures claimed size by 1.07374 to find out what size windows will recognise it as.

  JerryJay 14:05 05 Feb 04


Thank you for correcting me. It seems that I am still in IT stone age.

  Microdot 14:38 05 Feb 04

It's a Digital world !!!!

It's a Binary world !!!!

2 to the power 10 = 1024

Cheers de Art.

  DieSse 21:16 05 Feb 04

Your point?

The abbreviation K (for Kilo) means 1000 units. It's always meant 1000 units and it still means 1000 units.

It's all very well to say 2ยนยบ = 1024 - but it's only in the computer world that the term K has been corrupted to mean anything other than 1000.

Now it doesn't worry me who uses what term - as long as they define which one they are using, and don't pretend that the computer version is the "correct" one.

  sibaw 11:34 06 Feb 04

Many thanks to you all but when I reformatted the drive I got back my 40K?

  JerryJay 15:33 06 Feb 04


I still think there is some misleading use of GB/MB/K .. It seems that the hardware people already accepted IEEE standard, but software people do not. In Microsoft Windows, GB still means 2^(30) bytes, not 10^9 bytes. If you go to "My Computer" and check property of any large directory, you will find what I mean, I checked one directory, it tells "Size 1.59GB (1,714,865,189bytes)". So Microsoft still think 1GB is 2^(30) bytes. Similar situation, 1 DVD disc cannot be filled with 4.9GB in many cd/dvd write software, it can only fill 4.56GB because CD/DVD write software still use 2^(30) as GB but disc producer use 10^9 as GB. Somebody should take this up to software makers to clear all misleading use of GB etc.

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