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Blu-Ray Disc
The Blu-Ray is an optical disc storage device. It is called Blu-Ray because it
Tick ( ) if you know this.
uses a blue/violet laser light to read and write data. It is used to record and
▶ Data and information on a computer are stored in the form of 0s and 1s, called binary digits.
Blu-Ray Disc store high-definition videos and can store up to 25 GB of data which is over
▶ 1 Terabyte is equal to 1024 Gigabytes. five times more data than a DVD.
SECONDARY MEMORY PURE
Secondary memory is the external memory of the computer that can store large amounts FACT A DVD and Blu-Ray Disc can store up to 4.7 GB data and 25 GB data respectively.
of data permanently. It is not directly accessed by the CPU. It is cheaper in comparison to
primary memory. Secondary memory devices are also called secondary storage devices.
Pen/Flash Drive
Hard Disk A pen drive is a small-sized storage device. It can be carried from one place
Hard disk is the main secondary storage device, used to store data to another in a pocket. It is used to transfer data from one computer to another
and information. It is fixed inside the CPU cabinet. It consists of one or and can be connected to the Universal Serial Bus (USB) port of a computer.
more magnetic disks which are used to store and restore digital Pen Drive
information for usage. Hard Disk Memory Card
It is also known as multimedia memory card. It is very small in size usually
Compact Disc (CD) 1-1.5 inches. These are used in various electronic devices like mobile
CDs are circular in shape. It can store a large amount of data and can be phones, digital cameras, etc. You need to have a card reader to read the
carried from one place to another easily. It can store up to 700MB of data. Memory Card stored data on a memory card.
CD There are three types of CDs:
Compact Disc-Read Only Memory (CD-ROM): It contains data that has been written Which memory is known as volatile memory?
at the time of manufacturing and cannot be modified or erased. uiz Bee
Compact Disc-Recordable (CD-R): It allows only one-time recording. Data written ______________________________________________________
once cannot be erased.
Compact Disc-Rewritable (CD-RW): It allows multi-reading. Data written on it can be
erased or rewritten. ONLINE STORAGE SITE (CLOUD STORAGE)
We can also store data on various online platforms that allow online storage,
Digital Versatile Disc (DVD) file sharing and syncing. It allows us to store data in an off-site location which
A DVD looks like a CD and can store up to six times more data than a CD. can be accessed later on any computer anywhere through the Internet. If OneDrive
There are two types of DVDs: we store data in a cloud storage, we can save money that would otherwise have to be
DVD
Digital Versatile Disc-Recordable invested in paying for storage devices.
(DVD-R): It allows only one-time Life Skills & Values
recording. “Do not hesitate to clear doubts from your
Digital Versatile Disc-Rewritable teachers. Learn something new every day.”
(DVD-RW): It allows to delete and -Mr Techie
rewrite data on it.
10 Trackpad (Version 1.0)-IV

