What is bigger a terabyte or a megabyte?

English obviously isn't your first language. If you mean "Which is more, a megabyte or a terrabyte?" then the answer is a terrabyte. There are 1024 Bytes in a Kilobyte, 1024 Kilobytes in a Megabyte, 1024 Megabytes in a Gigabyte, and 1024 Gigabytes in a Terrabyte.