So what comes after Petabyte? I think I knew this sometime, once upon a long time very far ago... but then I forgot all about. Thank the military there's Internet. I found the names and counted up this for future reference:

Byte - 8 Bit
Kilobyte - 1024 Byte
Megabyte - 1024 Kilobyte (1,048,576 Byte)
Gigabyte - 1024 Megabyte (1,073,741,824 Byte or 1,048,576 Kilobyte)
Terabyte - 1024 Gigabyte (1,099,511,627,776 Byte or 1,073,741,824 Kilobyte)
Petabyte - 1024 Terabyte (1,125,899,906,842,624 Byte or 1,099,511,627,776 Kilobyte)
Exabyte - 1024 Petabyte (too many numbers!)
Zettabyte - 1024 Exabyte (too many numbers!)
Yottabyte - 1024 Zettabyte (too many numbers!)
Vertabyte - 1024 Yottabyte (too many numbers!)
Tecabyte - 1024 Vertabyte (too many numbers!)
Parlabyte - 1024 Tecabyte (too many numbers!)

And after that? I guess we'll know in a few years. :)