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Drive capacity in bios VS. Windows 7

Last response: in Storage
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October 15, 2010 11:42:18 PM

I just built a new system using Windows 7 64-bit. It is installed on a Samsung Spinpoint F3 1TB drive. The bios shows the drive capacity as 1TB, however Windows shows the capacity as 931GB with 914GB of free space. I know the actual capacity of a drive is usually less than the stated, but by nearly 69GB! When I installed Windows I was never prompted to format the drive nor are there any partitions. Do I need to format a drive for Windows 7?

Asus P7P55D-E PRO
Intel i5-760
4 GB G. SKILL RAM
Samsung Spinpoint F3
Lite-on 24x DVD Drive

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October 26, 2010 7:57:39 AM
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sno-twister76 said:
however Windows shows the capacity as 931GB with 914GB of free space. I know the actual capacity of a drive is usually less than the stated, but by nearly 69GB!


It is most likely because of the confusion when the computer world uses the standard k, M and G as something else than 1000 (computer k=1024), 1000000 as M=1048576 and so on.

In the computer world 1 GB is not 1 000 000 000, but 1073741824.

Windows says your drive is 931 GB. Take "computer G" 1073741824 * 931 and you end up with 999 653 638 144, which is very close to 1TB (real T). So it is not Windows that fools you, but somewhat Samsung that sells their drive which really is almost 1TB (i.e. 1000 000 000 000), but not computer-TB... ;) 

sno-twister76 said:

Do I need to format a drive for Windows 7?


No, it is being done by the Windows installation program.
October 26, 2010 10:11:17 PM

Best answer selected by sno-twister76.
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October 26, 2010 10:13:38 PM

Thanks ricno! That now make sense, sort of. At least the numbers add up and I'm not missing any space.
October 26, 2010 11:21:30 PM

sno-twister76 said:
Thanks ricno! That now make sense, sort of. At least the numbers add up and I'm not missing any space.


Glad to help!

Check out this article to read more of this confusion, especially the part about harddrives:

http://en.wikipedia.org/wiki/Binary_prefix

!