Lenovo Q180 User's Guide download pdf (Page 20)

User Guide

3.4 Troubleshooting problems with Hard Disks

Problem: The capacity of the hard disk, as indicated by the system, is less than

the nominal capacity.

Troubleshooting and problem resolution: For computers equipped with the

OneKey Recovery feature, the system recovery feature needs to occupy some

hard disk space. This may account for the apparent hard disk capacity deﬁcit.

Further Technical Explanation: The nominal capacity of the hard disk is

expressed in the decimal system, 1000 bytes. But the actual hard disk capacity is

expressed in the binary system as 1024 bytes (For example, a nominal capacity of

1GB is 1000MB, while the actual capacity of 1GB is 1024MB).

The capacity of the hard disk shown in Windows can be worked out according to

the calculations in the following example:

The nominal capacity of the hard disk is 40GB, while its actual capacity

should be: 40 x 1000 x 1000 x 1000/(1024 x 1024 x 1024) = 37GB.

If the Service partition of 3GB - 3 x 1000 x 1000 x 1000/

(1024 x 1024 x 1024) = 2.79GB is subtracted, the capacity of the hard disk

shown in the system can be obtained.

The capacity of the hard disk as calculated using this method may be slightly

different from the actual capacity due to the rounding of totals.

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Lenovo Q180 User's Guide Page 20