Megabytes, gigabytes and tetrabytes......

whats the size difference between these and is there anything bigger still ?
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1000 bytes = 1 kilobyte (KB)
1000 Kilobytes = 1 Megabyte (Mb)
1000 Megabytes = 1 Gigabyte (Gig)
and I think 1000 Gigabytes = 1 Terrabyte.
I don't think there is anything bigger. If there is then I can't think of a situation when you would need to use it.

There is always something bigger.  It just may not have a practical name as yet.  Additionally,  these quantities are not really powers of 10 (or factors of 1000).  That is just a convenient way of thinking of them.  In reality, they are powers of 2 (or factors of 2^10) as follows:

1 Kilobyte (Kb) = 2^10 bytes = 1024 bytes

1 Megabyte (Mb) = 2^20 bytes = 1024 Kb

1 Gigabyte (Gb) = 2^30 bytes = 1024 Mb

1 Terabyte (Tb) = 2^40 bytes = 1024 Gb

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