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

 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.

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

these devices?

 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
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Speed up computer process. Improve loading time.

Always associate hard disk with RAM. And

thinks its the same. ITS A MYTH!

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.
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Primary
This storage is the fastest

Secondary
Is a storage medium that

memory in your computer

Is used to store data while

it's being used.

For example, when you

holds information until it is deleted or overwritten regardless if the computer has power.
A floppy disk and hard disk

open a program data is moved from the secondary storage into the primary storage.

are both good examples of secondary storage devices

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Size/ Capacity Speed

RAM

ROM

 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. RAM.

Each time you start a program e.g. MS Word, it is loaded into

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.
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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

doesnt disappear after the computer is switched off.

operating system from the hard drive into the computers memory.

ROM chips instruct the computer how to load the

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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
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Advantages
Necessary to support the way your computer works Large storage capacity Stores and retrieves data much faster than floppy disk or CD/DVD Stored items are not lost when you switch off the computer Cheap on a cost per megabyte compared to other storage devices

Limitations
Far slower to access data than ROM or RAM chips Can crash which stop the computer from working Regular crashes can damage the surface of the disk, leading to loss of data in that sector The disk is fixed inside the computer and cannot easily be transferred to another computer
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 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.

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Advantages

Limitations

Stores more data than a floppy disk Compresses data, reducing the file size, so more data can be stored Portable

Almost obsolete now

Need a separate zip drive to read the disk More expensive than floppy disks.
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 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.
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Advantages Portable small and lightweight

Limitations Not very strong easy to damage

Data can be erased if the disk comes into contact with a magnetic field Useful for transferring small files between Quite slow to access and retrieve data home and school when compared to a hard disk Security tab to stop data from being Can transport viruses from one machine written over to another Can be used many times Small storage capacity Many new computers do not have floppy disk drives
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Inexpensive

 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.

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Advantages
Small and portable Very cheap to produce Most computers can read CDs. If there is no CD drive, a DVD drive can usually read them Fairly fast to access the data quicker than a floppy disk or magnetic tape

Limitation
Fairly fragile, easy to snap or scratch Smaller storage capacity than hard drive or DVD Slower to access than the hard disk

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 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.

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Advantages
Very large storage capacity Sound and picture quality is excellent, making them ideal for storing films with video and sound DVDs are now mass produced so they are relatively cheap DVD players can read CDs

Limitations
DVDs do not work in CD drives There is no single standard of DVD They can be easily damaged by breaking or scratching

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 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.
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Advantages
More compact and portable than floppy disks or CDs/DVDs Hold more data than floppy disk and nowadays often more than a CD More reliable than a floppy disk because they have not moving parts They are being developed with fashionable looking outer casings and are almost becoming a fashion accessory much in way of a mobile phone.

Disadvantages
At the moment, the cost per megabyte of storage is more expensive than floppy disks, CDs or DVDs They can be easily lost

The metal part which is inserted into the USB port can be snapped off if they are handled roughly

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 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.
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ADVANTAGES
CAN HOLD LARGE AMOUNT OF DATA 4 TO 16gb VERY PORTABLE

LIMITATION
SOMETIME EASY TO LOOSE DUE TO ITS SIZE WHICH IS VERY SMALL SOME OF THE CARD ARE NOT COMPATIBLE WITH LAPTOP OR COMPUTER

COST EFFECTIVE IN TERMS OF PRICE

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

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STORAGE MEDIA
FLOPPY DISK FLOPPY DISK DRIVE

CD and DVD

DVD - CD ROM DRIVE

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STORAGE MEDIA
PENDRIVE AND EXTERNAL HARD DRIVE USB DRIVE

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