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Depending on the software application being used, calculating the capacity size of hard drives that are larger than 137GB can be somewhat confusing because of the way in which the size may be reported.
Hard drives smaller than 137GB are typically 28-bit LBA. Listed below are the different size calculations based on a hard drive that is 128GB:
(2 ^ 28 sectors) x 512 bytes = 137438953472 bytes = 134217728KB = 131072MB = 128GB
Once you get beyond 128GB you start accessing the 48-bit area. The above calculations are based on the following assumption: 1KB = 1024 bytes. If you calculate using 1KB = 1000 bytes, then you will get 137.439853472GB as the total size.
This information is important to understand if you are trying to determine if the operating system has correctly recognized the full capacity of hard drives larger than 137GB. If the operating system or an application reports that the total capacity of your hard drive is 131072MB, this indicates that it is only recognizing 128GB and it is not currently accessing the 48-bit area.
This applies to:
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