Abstract: A memory card accessing system boots a computer host by means of a memory card reader that loads and reads different types of memory card. The memory card accessing system includes a multi-type memory card reader and a computer host. The memory card accessing system detects if any booting application exists on one of the memory cards on the memory card reader. If a system firmware has set the booting operation to the memory card reader, and the reader firmware has detected the presence of a booting application on one of the memory cards, the corresponding memory card is identified as a logic disk for the memory card reader to boot the computer.