The external (auxiliary) memory of the microcomputer refers to the disk. RAM and ROM are both internal memories of computers. A virtual disk is not a physically existing storage. Although the hard disk is located in the main chassis, it is a peripheral device and an external memory.
External storage refers to storage other than computer memory and CPU cache. This type of storage can generally still save data after power is turned off. Common external memories include hard disks, floppy disks, optical disks, U disks, etc.
Common external memories in PCs include floppy disk memory, hard disk memory, optical disk memory, etc. There are two types of disks: floppy disks and hard disks. There are three types of optical discs: read-only CD-ROM, write-once optical disc WORM, and rewritable optical disc MO.
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