8 Answers

Megabytes – Gigabytes – Terabyte – Units of Digital Measurement
What is a byte, and what are the other units of measure for digital information?
A byte is a unit of measure for digital information. A single byte contains eight consecutive bits, and is capable of storing a single ASCII character, like “h”.
A kilobyte (KB) is 1,024 bytes, not one thousand bytes as might be expected. This odd number results from the fact that computers use binary (base two) math, instead of a decimal (base ten) system.
Computer storage and memory is often measured in megabytes (MB). A mediumsized novel contains about 1MB of information. 1MB is 1,024 kilobytes, or 1,048,576 (1024×1024) bytes, not one million bytes. Again, this number results from the fact that computers use binary math.
1 kilobyte (KB) is 1,024 bytes
1 MB is 1,024 kilobytes
1 gigabyte (GB) is 1,024MB, or 1,073,741,824 (1024x1024x1024) bytes.
1 terabyte (TB) is 1,024GB; 1TB is about the same amount of information as all of the books in a large library, or roughly 1,610 CDs worth of data.
1 petabyte (PB) is 1,024TB. Indiana University is now building storage systems capable of holding petabytes of data.
1 exabyte (EB) is 1,024PB.
1 zettabyte (ZB) is 1,024EB.
1 yottabyte (YB) 1,024ZB.

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RE:
how many gigabytes in a terabyte?

1024 gigabytes in a terabyte

either 1000 or 1024; both conversions are used but if you are talking about the advertized storage of harddisks, usually 1000 is used by the mfr because it makes the drive look bigger, i.e. 1 gigabyte is a billion bytes (10^9 not 1024^3) and a terabyte is a trillion bytes (10^12 not 1024^4)

1 terabyte = 1024 gigabytes

a terabyte is approximately thousand billion bytes that is, a thousand gigabytes

there are 1000 GB

1000, though the unit for kb are 1024, it should be 1024Mb in a Tb