Manual Lenovo B 450 (page 4 of 128) (English)

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Explanation of hard disk capacity

Dear user,

While using your computer, you may find that the nominal hard disk

capacity indicated is somewhat different from the disk capacity

displayed by the operating system. For example, a nominal 40GB hard

disk will appear as less than 40GB in the operating system. This

discrepancy is not an error in hard disk installation nor any other

problem, but a normal phenomenon of computers. This phenomenon is

primarily due to the following reasons:

I. Different standards used by the manufacturer and operating

system when calculating hard disk capacity

Hard disk manufacturers use a radix of 1000, i.e., 1G = 1,000MB, 1MB =

1,000KB, 1KB = 1,000 bytes. However, when identifying hard disk capacity,

operating systems use a radix of 1024, i.e., 1GB = 1,024MB, 1MB = 1,024KB,

1KB = 1,024 bytes. The standard adopted by your computer is that of the

hard disk manufacturers. Since the standards adopted by the hard disk

manufacturer and operating system are different, the hard disk capacity

displayed by the operating system will be different from the nominal hard

disk capacity.

For example, if the hard disk is nominally X G, even when it is completely

empty, the capacity displayed by the operating system will be:

X × 1000 × 1000 × 1000/ (1024 × 1024 × 1024) ≈ X × 0.931 G

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Lenovo B 450 Manual

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