The standard prefixes for data storage are:
* Kilobyte (KB): 1,024 bytes
* Megabyte (MB): 1,024 kilobytes
* Gigabyte (GB): 1,024 megabytes
* Terabyte (TB): 1,024 gigabytes
* Petabyte (PB): 1,024 terabytes
* Exabyte (EB): 1,024 petabytes
* Zettabyte (ZB): 1,024 exabytes
* Yottabyte (YB): 1,024 zettabytes
It's possible you've heard the term "pedabyte" incorrectly. It's likely a misunderstanding of "petabyte" which is a much larger unit of data storage.