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Done by: Mohammad Fadhullah bin Matyassin. : Mohammad Daud Bin Mohd Zain. 1.

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Presentation on theme: "Done by: Mohammad Fadhullah bin Matyassin. : Mohammad Daud Bin Mohd Zain. 1."— Presentation transcript:

1 Done by: Mohammad Fadhullah bin Matyassin. : Mohammad Daud Bin Mohd Zain. 1

2  Define what is Storage Devices.  List down classification Storage devices.  Define Primary Storage (RAM & ROM).  Define Secondary Storage/ Backing Storage.  Name at least 3 storage devices of parts of computer.  State ONE function of at least THREE storage devices of parts of computer. 2

3  What is these thing really do in our daily life?  What kind of work or job that associated with these devices? 3

4 A computer repair technician is a person who repairs and maintains computers. The technician's responsibilities may include building or configuring new hardware, installing and updating software packages, and creating and maintaining computer networks 4

5  Speed up computer process.  Improve loading time.  Always associate hard disk with RAM. And thinks its the same. IT’S A MYTH! 5

6  Storage devices are devices that can store data or information.  There are various type of storage devices. Different devices are suitable for different tasks.  Data can be stored either in the ‘Internal Memory’ or on a ‘Storage Devices’. 6

7 Primary  This storage is the fastest memory in your computer  Is used to store data while it's being used.  For example, when you open a program data is moved from the secondary storage into the primary storage. Secondary  Is a storage medium that holds information until it is deleted or overwritten regardless if the computer has power.  A floppy disk and hard disk are both good examples of secondary storage devices 7

8  Size/ Capacity  Speed 8


10  Temporary, short-term working memory.  Only works when the computer is turned onIt is also known as “Volatile Memory” because data disappears if the power is switched off.  Each time you start a program e.g. MS Word, it is loaded into RAM.  The amount of RAM influences processing power, speed and how many programs can run at the same time.  Many computers are now sold with 4 to 8 GB of RAM. 10

11  It is permanent, long-term memory which cannot be erased or changed in any way  It is also known as “Non-Volatile Memory” because it doesn’t disappear after the computer is switched off.  ROM chips instruct the computer how to load the operating system from the hard drive into the computer’s memory. 11

12  Hard Disks are the main internal backing store usually found inside computers.  It is a non-volatile storage device. Data is stored on a spinning disk with a magnetic surface known as magnetic media.  It can store a large amount of data.  There is also an external hard disk which connected to the computer system by a USB cable or other means.  It provides additional storage space for the computer system 12

13 AdvantagesLimitations Necessary to support the way your computer works Far slower to access data than ROM or RAM chips Large storage capacityCan crash which stop the computer from working Stores and retrieves data much faster than floppy disk or CD/DVD Regular crashes can damage the surface of the disk, leading to loss of data in that sector Stored items are not lost when you switch off the computer The disk is fixed inside the computer and cannot easily be transferred to another computer Cheap on a cost per megabyte compared to other storage devices 13

14  Very popular as a backup medium before CD-RWs were developed and became cheap enough for everyone to use.  Look similar to a floppy disk but are a little bit thicker.  They can store around 100Mb of data – 70 times more than floppy disk. 14

15 AdvantagesLimitations Stores more data than a floppy disk Almost obsolete now Compresses data, reducing the file size, so more data can be stored Need a separate zip drive to read the disk PortableMore expensive than floppy disks. 15

16  One of the oldest types of portable storage devices still in use.  Have been around since the 1980s.  Store up to 1.44 Mb of data which equivalent to around 300 pages of A4 text.  Graphics and WordArt cannot be stored because there have larger size than the size of floppy disk. 16

17 AdvantagesLimitations Portable – small and lightweightNot very strong – easy to damage InexpensiveData can be erased if the disk comes into contact with a magnetic field Useful for transferring small files between home and school Quite slow to access and retrieve data when compared to a hard disk Security tab to stop data from being written over Can transport viruses from one machine to another Can be used many timesSmall storage capacity Many new computers do not have floppy disk drives 17

18  Also known as Optical Storage Devices.  Data is burned onto the surface of the disk using a laser beam in the CD drive.  A Laser beam is also used to read the data stored on the disk.  A typical CD can store around 650 Mb of data – equivalent to 450 Floppy disks. 18

19 AdvantagesLimitation Small and portableFairly fragile, easy to snap or scratch Very cheap to produceSmaller storage capacity than hard drive or DVD Most computers can read CDs. If there is no CD drive, a DVD drive can usually read them Slower to access than the hard disk Fairly fast to access the data – quicker than a floppy disk or magnetic tape 19

20  Short for Digital Versatile Disc or Digital Video Disc, a DVD or DVD-ROM.  is a disc capable of storing large amounts of data on one disc.  today they are widely used for storing and viewing movies and other data.  To play a DVD on a computer a user must have a DVD drive as well as a DVD player,  One of the most common DVD's is the single-sided, single-layer disc, capable of holding 4.7 GB. 20

21 AdvantagesLimitations Very large storage capacityDVDs do not work in CD drives Sound and picture quality is excellent, making them ideal for storing films with video and sound There is no single standard of DVD DVDs are now mass produced so they are relatively cheap They can be easily damaged by breaking or scratching DVD players can read CDs 21

22  Alternatively referred to as a USB flash drive, data stick, pen drive, keychain drive and thumb drive, a jump drive, portable drive.  Typically small, lightweight, removable and rewritable.  They consist of a small printed circuit board which is encased in a plastic or metal casing.  They usually have a removable cap which covers and protects the part of the stick which is inserted into a USB port.  Are available from 1 Gb up to 6 Gb. 22

23 AdvantagesDisadvantages More compact and portable than floppy disks or CDs/DVDs At the moment, the cost per megabyte of storage is more expensive than floppy disks, CDs or DVDs Hold more data than floppy disk and nowadays often more than a CD They can be easily lost More reliable than a floppy disk because they have not moving parts The metal part which is inserted into the USB port can be snapped off if they are handled roughly They are being developed with fashionable looking outer casings and are almost becoming a ‘fashion accessory’ much in way of a mobile phone. 23

24  Alternatively referred to as a flash memory card  type of storage media that is most commonly used in digital cameras, digital camcorders, handheld computers, MP3 players, PDAs, cell phones, game consoles, and printers, to store pictures, videos, music, and other data.  There are a handful of different types of memory cards on the market, each varying in size, compatibility, and storage capacity. 24


26  External drives are often stored in an enclosure that helps protect the drive and allow it to interface with the computer, usually over USB or eSATA.  External hard drives come in many shapes and sizes. Some are large, about the size of a book, while others are about the size of a cell phone.  External hard drives can be very useful for backing up important data and taking with you on the go. They can store a lot of information, including music and pictures. 26

27 ADVANTAGESLIMITATION External drives are easier to transport from computer to computer than internal generally cost much more for the same amount of storage space than internal externals are better for storing data that you'd like to share with people easily transfer/access files more slowly than an internal drive. (Copying things to and from an external take longer than your regular hard drive) 27



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