As One_Hertz said, the SMART data is apparently in TB. And outside of Windows, I have seen most programs use the units correctly. Certainly most linux programs don't have the Windows bug of displaying incorrect units. Many of the linux command line utilities allow a choice of which units to display.
GParted displays in GiB and TiB. Palimpsest (linux disk management util) displays in TB and bytes, so you can see it is using the correct unit labels. GSmartControl displays in TB, TiB, and Bytes.
The difference between TB and TiB is significant and worth paying attention to, IMO. It is about a 10% difference, so I don't want to get it wrong...
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