Identify the primary function perform by input / output control system Compare between logical I/O and physical I/O. Distinguish between Directory Management and Disk Space Management Describe boot process

2.  Identify the primary function perform by
input / output control system
 Compare between logical I/O and physical
I/O.
 Distinguish between Directory Management
and Disk Space Management
 Describe boot process

3.  provided low level access to records on
peripheral equipment.
Example1: logical I/O Example1: Physical I/O

4. Directory Management
The purpose is organize file, directory and
operation on them
Disk Space Management
The purpose is manage files stored on disk.

5.  Booting up is a bootstrapping process that
starts operating systems when the user
turns on a computer system
 Booting is the process of starting or
restarting a computer

6. 1. Cold Boot
2. Warm Boot

7.  When turning on a computer that has been
powered off completely.
 Example : by press power button.

8.  Is the process of restarting a computer that
already is powered on.
 Example : In Windows XP, warm boot can be
perform by :
a. pressing combination of (CTRL + ALT +DEL)
b. selecting a button or an option from a list in a
dialog box
c. pressing the reset button on the computer

9. 1. The power supply send a signal to the
components in the system unit.
2. The processor finds the ROM chip(s) that contain
the BIOS (basic input output system). BIOS is a
firmware that contain computer’s startup
instructions.
3. The BIOS performs the POST(power-on self test),
which checks components such as mouse,
keyboard and adapter cards. The test is to check
computer hardware connected properly and
operating correctly.

10. 4. The results of the POST are compared with
data in a CMOS chip. CMOS is the technology
that uses battery power to hold information
when the computer is off.
5. The BIOS looks for the system file in drive A
(floppy disk drive), sometimes a CD or DVD
drive and then drive C (hard disk)

11. 6. The system file and the kernel of the
operating system load into memory (RAM)
from storage (hard disk)
7. The operating system loads configuration
information, may request user information
and display the desktop on the screen.

12.  BIOS works by reading the first sector of the
hard drive which has the next device’s
address to initialize or code to execute. BIOS
also selects the boot device that needs to be
initialized for starting the operating system.
Since BIOS has been in use since the very
beginning, it still works in 16-bit mode,
limiting the amount of code that can be read
and executed from the firmware ROM.

13.  UEFI does the same task a little differently. It
stores all the information about initialization
and startup in an .efi file instead of the
firmware.
 This file is stored on the hard drive inside a
special partition called EFI System Partition
(ESP). The ESP partition will also contain the
boot loader programs for the Operating
System installed on the computer.

14. UEFI vs BIOS

15. BIOS UEFI
 Uses Master Boot
Record (MBR)
 GUID Partition Table
(GPT)
 Since UEFI is platform
independent - enhance
the boot time and
speed of the computer
 Secure boot