big soft moose
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Kb - Kilobyte. 1/1024 of a Mb. Will be used for smaller files <1Mb on some systems (e.g. Apple's IOS shows small files as KB rather than a fraction of a Mb)
Tb - Terabyte. 1024 Gb. Huge capacity, usually seen in reference to hard disk sizes. e.g 2 x 500Gb drives = 1x 1Tb drive.
[pedant] strictly speaking a small b denotes bits not bytes , so 2mb is 2 mega bits ( there are 8 bits to a byte , so 2 mb is 1/4 of a megabyte) , bytes are denoted by a capital B , so KB, MB, GB etc - this is a common area of confusion when dealing with broadband speeds which are in Mb/sec not MB/sec [/pedant]