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#### kwack111

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my laptop says it comes with 40GB ATA HD, but when i look in
"my computer" it says by the C drive:

total size: 34.2 GB
free space: 29.8 GB

i'm thinking that from 29.8 till 34.2 is all the programs that's preinstalled,
but what about from 34.2 till 40, where did that go?

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If on XP:

Right click My Computer --> Manage --> Disk Management.

See if there are other partitions for the drive. Sometimes there's a Recovery Partition so if you screw up your computer you can reload the software from the Recovery Partition.

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Yep, I would bet on the "recovery partition" thing also. Easier than having to find a restore CD somewhere 2 years later.

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it's marketing lies and math tricks.

80AGB (actual GB) = 80*1024*1024*1024 = 85,899,345,920bytes

80MGB (marketing GB) = 74.5GB*1024*1024*1024 = 79,993,765,888bytes

right click on your 80GB drive and go to properties in explorer, i bet it says 74.5

2^10 = 1024, there's a reason everything in computers is a power of 2, but i won't go there ^_^

#### CodeWeasel

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I think sadpanda has the right answer for you. Basically to reiterate what he said:

By normall math 1K = 1000

But computers think in Binary which is why everything must to the power of 2. 1024 is the nearest binary number to 1000.

Thus 1 Kb = 1024 bytes

To use my 60 Gb drive as a example

The drive is 59, 962, 290, 176 bytes which one would normally read as 60 Gb. But.......

59,962,290,176 / 1024 / 1024 / 1024 = 55.8 Gb

Thus my 60Gb drive has an actuall capacity of 55.8.

I don't think it's marketing lies, I just think that most people would be confused to tell them that 1Kb = 1024 bytes.