CompTIA Tech+ (FC0-U71) Practice Exam

MB stands for Megabyte. In digital storage, the uppercase B denotes bytes, and a byte is made up of 8 bits, so MB measures how much data something contains (its size or capacity). This differs from Megabit (Mb) or Mbps, which describe data transfer rates rather than amount stored. Megahertz (MHz) is a unit of frequency, not data size, so it’s unrelated to how much data a file takes up. For example, a file sized at 10 MB has about ten million bytes of data, while a network speed described as 10 Mbps means ten million bits per second. Remember the case matters: B is bytes, b is bits.