css

1. Disk Management
Q2_W3_D3
Randy M. Garay
Subject Teacher

2. CONTENTS
 Overview of disk management
 Difference between a disc & a disk
 Disk terminology
 Disk Structure
 Disk Scheduling
 Disk Operations
 Disk management tools

5. What's the difference between a "disc" and a "disk “?
Discs Disks
-refers to optical media, such as an
audio CD, CDROM,
DVD-ROM, DVD-RAM, or DVD-
Video disc.
-are removable, meaning when you
unmount or eject the disc from your
desktop, it physically comes out of
your computer.
-refers to magnetic media, such as a
floppy disk, the disk in your
computer's hard drive, an external
hard drive.
Disks are usually sealed inside a
metal or plastic casing (often, a disk
and its enclosing mechanism are
collectively known as a "hard
drive").

6. What is Disk Management ?
Disk Management is a Microsoft Windows utility first
introduced in Windows XP as a replacement for the fdisk
command.
It enables users to view and manage the disk drives
installed in their computer and the partitions associated
with those drives.
As can be seen in the picture below, each drive is
displayed followed by the layout, type, filesystem, status,
capacity, free space, % free, and fault tolerance.

7. 1. Master Boot Record (MBR)
-the information in the first sector of any
hard disk that identifies how and where an
operating system is located so that it can be
loaded into the computer's main storage or
random access memory.
MBR does have its limitations, only works with
disks up to 2 TB in size.

8. 2. Global Partition Table (GPT)
-newer standard that’s gradually replacing
MBR.
-associated with UEFI.
-It’s called GUID Partition Table because every
partition on your drive has a “globally unique
identifier.

9. 3. Virtual Hard Disk (VHD)
-a disk image file format for storing the
complete contents of a hard drive.
-disk image, sometimes called a virtual
machine, replicates an existing hard drive and
includes all data and structural elements.

10. 4. Basic Disk
-physical disk that contains primary
partitions, extended partitions, or logical
drives.
-can be accessed by all versions of Windows, MS-
DOS, and Windows NT.
-can contain up to four primary partitions, or three
primary partitions and an extended partition with
multiple logical drives.

11. Disk Terminology
It is the sum set of tracks that have the
same track value of all discs. Also
referred to as group of tracks with same
radius
REDYLINC
CYLINDER

12. Disk Terminology
It is a circular path on the surface of
disk or diskette on which information is
magnetically recorded and from which
recorded information is read.
KARTC
TRACK

13. Disk Terminology
It is a subdivision of a track on a
magnetic disk or optical disk. Each
stores a fixed amount of user accessible
data.
SCROTE
SECTOR

14. Disk Structure

15. Disk Performance Parameters
 Seek Time
 The time it takes to move the disk arm to the required
cylinder
 Rotational Latency
 The time it takes for the disk to rotate so that the required
sector is above the hard disk
• Access Time
 The time it takes to get in position to read or write.
 Seek time + Rotational Latency
• Time to get the data
Access Time + Transfer time

16. How to partition hard disk

19. Directions: Write a reflection of your learning
journey about this lesson using the guide
phrases below.
1. I have learned
that____________________________
2. I have realized
that___________________________