1TB drive has only 930GB free space

Q: Why does my 1TB drive only seem to have 930GB free space? Even after an NTFS format

A: The drive manufacturers use a standard metric system to determine the drive size.

According to the packaging(marketing hype)

1TB = 1000,000,000,000 bytes

This might seem correct, but the real way bytes should be calculated is like this

1TB = 1000bytes x 1024 (kb) x 1024 (mb) x 1024 (gb)

This accounts for the 7% space exageration by the drive manufacturers. So next time you’re out buying storage, expect to loose 7% of the capacity advertised on the box.

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One thought on “1TB drive has only 930GB free space

  1. Do you realize that adding a filesystem to a drive such as NTFS actually takes up quite a lot of space? File Alocation Tables, MFT reservations, etc…

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