Question: what is mean by 1 tb?
Answer: The prefix tera represents the fourth power of 1000, and means 1012 in the International System of Units (SI), and therefore one terabyte is one trillion (short scale) bytes. The unit symbol for the terabyte is TB. 1 TB = 1000000000000bytes = 1012bytes = 1000gigabytes. 1000 TB = 1 petabyte (PB)