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Tebibyte (TiB) is one of the standard units used in the field of data processing and data transmission (along with gibibyte (GiB), mebibyte (MiB), kibibyte (KiB), etc.). Tebibyte, gibibyte, mebibyte, and kibibyte are defined as powers of 2. 1 TiB equals 240 bytes or 1,099,511,627,776 bytes. Tebibyte is closely related to terabyte (TB), which can be a synonym of tebibyte or can refer to 1012 bytes or 1,000,000,000,000 bytes in accordance with International System of Units (SI).
Terabyte (TB) can have different meanings in different contexts. When referring to computer memory, terabyte is allways a “power of two” - 1,099,511,627,776 bytes, but when measuring hard drive capacity it is often defined as 1,000,000,000,000 bytes. Generally, operating systems calculate disk and file sizes using binary numbers, so a new 5.0 TB drive you've just purchased would be reported by the OS as "4.547 TB" (meaning 4.547 TiB).
For conversion to other units no listed on this page use File / Disk Size Converter
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Prefixes for binary multiples - http://physics.nist.gov/cuu/Units/binary.html