GB Converter
Converts gigabytes to megabytes, terabytes and bytes using 1000 and 1024, and shows how much space Windows will report.
Enter a drive, flash drive, or plan size; you can type the unit right in the field: "2 TB". The answer also shows what Windows will report.
Why the drive is smaller than advertised
The manufacturer counts a gigabyte as a billion bytes, while Windows divides by 1024 three times. That is why a 64 GB flash drive shows 59.6 GB, a 500 GB drive shows 465 GB, and a 2 TB drive shows 1.81 TB. No space is lost: the number of bytes is the same, only the counting rule differs.
macOS and iOS count by 1000, the same way the manufacturer does, as stated in Apple's support note on storage capacity. Some of the space is still taken up by partitioning and the system.
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