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A disc with a capacity of 25 gigabytes is equivalent to 23.28 gibibytes, depending on whether you are using a base-2 system or a base-10 system. Additionally, some of that space is reserved as overhead for the file system as well as error-correction information. This results in a true recordable capacity of 23.28 gibibytes instead of the 25GB stated on the package.

The same situation is true of dual-layer Blu-ray discs. These are normally rated with a 50GB capacity, but in practice you can record about 46.57GB of data on a disc. Again, this is due to differences in the way the disc capacity is measured plus a small percentage of space reserved for file system information.


Written by youryblog

October 6, 2014 at 1:07 AM

Posted in HW, IT, MacOS

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