Single User, Single process System

In this system – only one user is present and one process is running at any time. Memory management is easy – memory is divided into two parts – one for the Op system and one for the program currently being executed.

Fixed Partitioning

Main memory divided into a number of fixed size partitions – partitions may be the all the same size or unequal size partitions.

Internal Fragmentation

Fixed Number of processes in memory

Contiguous memory

No Longer used