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650 Gb, but 580 GB?


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#1
hospitaldoctor

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I bought a Dell computer with 650 GB harddrive... however after checking the peripherals and the free space in My Computer it says:
549 GB free of 580 GB
is something wrong here?
Am I being jipped out of 70 GB?
Why is it like this?
Thanks
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#2
stettybet0

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Hard drive manufacturers measure hard drive space in decimal format. So, to them, 650GB is 650 x 1000^3 (650000000000) bytes. However, Windows measures hard drive space in binary format. So, to Windows, your 650000000000 bytes are only equivalent to ~605GB (605 x 1024^3 bytes). As for the other 25 gigabytes, I'm willing to bet they are in a separate recovery partition. In My Computer, do you see a D: drive?
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#3
hospitaldoctor

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Yes
drive D is: 5 GB free out of 15 GB
so?
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#4
stettybet0

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Well, that leaves 10GB unaccounted for. However, I've never heard of a 650GB hard drive, though 640GB is a common size. Perhaps Dell mislabeled/lied about the true size of the hard drive, and it really is a 640GB drive. That would explain the remaining 10GB.
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#5
hospitaldoctor

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My mistake
it is 640GB Serial ATA 2 Hard Drive 7200RPM
So 580 + 15 = 595
where is the other 45 though?
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#6
makai

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Actually Windows calculates "gigabytes" with a factor of about 1.073. So if you take what windows is saying you have 580 GB and multiply that be 1.073, you get 622gb. Now if you add 622 and 15 (actually 15 X 1.073), that equals about 640gb. You're not missing anything.
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#7
stettybet0

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That is basically what I stated above, although I was being more precise. 1024^3 is 1073741824, while 1000^3 is 1000000000, so 1024^3 is larger by a factor of 1.073741824. :) When you divide 640GB by 1.073741824, you get 596GB. So, yes, no hard drive space is missing.
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#8
makai

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That is basically what I stated above, although I was being more precise. 1024^3 is 1073741824, while 1000^3 is 1000000000, so 1024^3 is larger by a factor of 1.073741824.

:) That must be the "new math". :)
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#9
TheWhiteRose000

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recycle bin takes 10 gigs.
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