Hardware configuration dimensions :
The memory includes an internal memory (RAM), an external memory (external memory), registers.
A memory comprising a read only memory ( a ROM , the Read Only Memory) (read-only, data retention after power off), a random access memory ( the RAM , the Random Access Memory) ( main memory ) ( memory ) (readable and writable off after the data is lost), a cache memory (cACHE).
External memory , including disk , optical disk, U disk and so on.
Disk partition hard disks and floppy disks. Floppy disk capacity is small, it was eliminated in the CD era. CD CD burner required to write data, the disk was eliminated in the era of U.
Divided into mechanical hard disk drives, solid state drives, hybrid hard drives.
Register is part of CPU (Central Processing Unit) of.
From a functional point of view, the CPU inside a register composed of four parts, a controller, and a clock operator, a portion between the bus communication signal current on each other. Sub-bus data bus, a control bus, a status bus three.
Running Dimensions :
With up to only 32-bit memory 4G (virtual memory): 32-bit system, i.e., a length of 32 memory address, mapping the most 2 ^ 32 = 2 ^ 2 * 2 ^ 30 = 4G bytes.
Physical memory that is a random access memory space. Virtual memory that is part of the hard disk space mapped virtual memory. Physical memory is full even when physical memory fragmentation hard disk on-demand access to space.