Memory Access Method

 There are 4 Memory Access Method:

 
1. Sequential Access Method

Sequential Access

• Data access is very slow, because the data will be sorted access serially one by one.
• Data access is done sequentially, such as on magnetic tape.

    Example: Magnetic Tape, Cartridge Back Up.

 

2. Direct Access Method

Direct Access

 

• obtain data from a storage device by going directly to where it is physically located on the device rather than by having to sequentially look for the data at one physical location after another.
• Data-access relatively quickly, compared Sequential Access.

    Example: Hard Disk, Floppy Disk (floppy).

3. Random Access Method

Random Access

  

• Address Decoder will generate the address data to be accessed.
• Fast Data Access, faster than the Direct Access. 

    Example: RAM.

4.  Associative Access Method

• Access Data conducted by "compare", which compares the "content" of the data sought by the "key" of his, not based on address data.
• If the "matched" the data sought was found.
• Data-Access is very fast.   

    example: Cache Memory.