instructions can be executed or these data used by the computer, however, they must
be brought into the main storage unit of the computer. Computer programs and data
are held in auxiliary storage until called for 6y the control section of the CPU. Once
called up, the control section directs the transfer of the specified information into
assigned locations in the main storage. After processing is complete, the same
information and processed results can be sent back to the auxiliary storage.
direct (or random) access: a type of storage in which access can be made
directly to the data in any storage location (magnetic core, magnetic disk,
magnetic drum, or magnetic card).
sequential access: a type of storage in which data can only be stressed in the
sequence in which it is stored in the device (for example, magnetic tape or paper
Figure 2-32. Secondary storage media are connected to the CPU.