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USB flash memories

Memory sticks/ Flash memories (also known as pen drives) use solid state technology. They usually connect to the computer through the USB port. Their main advantage is that they are very small, lightweight devices which make them a suitable as a method for transferring files between computers. They can also be used as a back-up small devices for music or photo-files.

Blu-Ray Disks

Blu-Ray disks are another example of optical storage media. However,they are fundamentally different to DVDs in their construction and in the way they carry out read-write operations.

The main differences are:

  • A blue laser, rather than a red laser is used to carry out read and write operations.
  • A blu-ray can store up to five times more data than a normal DVD
  • Blu-ray uses a single 1.1mm thick polycarbonate disk, normal DVDs use a sandwich of two 0.6mm thick disks.
  • Using two layers can cause birefringence (light is refracted into two separate beams causing reading errors), because blu-ray uses only one layer the disk don't suffer from birefringence.
  • Blu-ray disks automatically come with a secure encryption system which helps to prevent privacy and copyright infringement.

Real Life Applications:

*Students will be able to comprehend and will list the use of the various storage devices based on their needs in the various applications.(In terms of storage capacity)

*Students create a video/presentation on the eminent readers of UAE and explain the steps to store the file on any one of the secondary storage devices.

Removable hard disk drives

Removable hard disk drives are essentially HDD but can be connected to the computer using one of the USB ports. In this way, they can be used as a back-up device or as another way of transferring files between computers.

DVD-RAMS

DVD-RAMS uses a very complete different technology to CDs and DVDs. They have the following features:

1. Instead of a single, spiral track, they use a number of concentric tracks/ rings.

2. Use of concentric tracks allows the simultaneous read and write operations to take place.

3. They allow numerous read and write operations (up to 100,000 times) and have great longevity (over 30 years) which makes them ideal for archiving.

What are offline storage devices?

Main Activity:

*Risers: Students define and understand the need for different secondary storage devices and list their uses.

*Flyers: Students will be able to design the basic structure of the secondary storage devices and it's applications.

*Champions: Students will analyse and compare the main differences with their properties

Examples of Offline Storage Devices

A term used to describe any storage medium that is non-volatile and whose data cannot be accessed by the computer once removed. A good example of off-line storage is a USB thumb drive. Off-line storage is used for transport as well as backup protection in the face of unpredictable events, such as hardware failure due to power outage or files corrupted by a computer viruses.

A USB thumb drive

1. CD/DVD/DVD-RAM (optical storage systems)

2. Blu-ray disks (optical storage systems)

3. USB flash/ memory sticks/SD-XD cards (solid state storage systems)

4. Removable/external hard disk drives (magnetic storage systems)

Home Learning

Students will complete their home learning task and post it on edmodo.

*Risers: Collect few samples of removable storage devices and list their applications

*Flyers: Explore and research on the future of optical media

*Champions: Explore and perform a research work using your textbook and the internet to find out all the different ways to store music files and movie files

*Extended Learning: Explore and compare the storage capacity of CDs/DVDs and Blu-ray disks

CD/DVD disks

CDs and DVDs are described as optical storage devices. Laser light is used to read data and to write data in the surface of the disk. Both CDs and DVDs use a thin layer of metal alloy or light sensitive organic dye to store data. Both systems use a single, spiral track which runs from the centre of the disk to the edge.

Starter Activity

* Do some research work on the topic 'offline storage devices' (use your gadgets).

After the research work discuss what are offline storage devices with the class.

Offline Storage Device

Done By: Sanika Rukshani

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