By comparing the input with the list of command, it acts by executing the required routines/commands or by searching for the required routine utility and loads it into the memory. COMMAND.COM contains routines that interpret what is typed in through the keyboard in the DOS command mode. If these two are found, they are loaded along with the DOS command interpreter COMMAND.COM. After the ROM boot strap loader turns the control over to boot record, the boot tries to load the DOS into the memory by reading the two hidden files IBMBIO.COM and IBMDOS.COM. The instructions/programs in the boot record then load the rest of the program. Memory allocation to the processes is also. Memory management keeps an eye on each and every memory location, in any case either it is allocated or it is not allocated (free).

All the memory devices such as hard disk, pen drive etc. One of the main functions of OS is to manage the primary and secondary memory.

Once this process is over, the ROM bootstrap loader attempts to read the Boot record and if successful, passes the control on to it. 3 Functions of Operating System (OS) Memory Management. The system start-up routine of ROM runs a reliability test called Power On Self Test (POST) which initializes the chips and the standard equipment attached to the PC, and check whether peripherals connected to the computer are working or not.

Disk management in operating system