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Memory Stick
Memory stick is a portable memory card used as an add-on for smartphones, digital cameras,
SmartTV etc. its capacity varies from 4 GB to 128 GB.
Memory Stick
Measuring Unit for Memory
The unit used to measure data stored in memory or storage devices is the byte. In computing, a byte for memory
is equivalent to a kilometer for distance, a second for time, or a kilogram for weight.
Computers work in binary digits— 0 and 1 to form endless combinations of 8 bits(1 Byte). This byte represents
a single letter, number, punctuation, or any other special character on the keyboard. These bytes combine in
different forms to represent data.
• Bit: A bit is the smallest measuring unit. It can be either 0(Off) or 1(On).
• Byte: A byte is the basic unit for measuring units. It is made up of 8 bits.
To represent huge data we have different units to measure as listed below:
1 Byte 8 Bits
1 Kilobyte (KB) 1024 Bytes
1 Megabyte (MB) 1024 KB
1 Gigabyte (GB) 1024 MB
1 Terabyte (TB) 1024 GB
1 Petabyte (PB) 1024 TB
1 Exabyte (EB) 1024 PB
1 Zettabyte (ZB) 1024 EB
Peripheral Device Ports
These ports act as a connector or a point of attachment between the external peripheral devices like mouse,
printer, keyboard, camera, scanner, etc. and the computer. There are different types of ports present in a computer
system. Some of the commonly used are discussed below:
• Serial Port: In Serial port data transmission between the computer and the peripheral device takes place in a
sequence of one bit at a time. It was used to connect mouse and external modems in older times. Nowadays it
is replaced by a USB port.
• Parallel Port: In Parallel port data transmission between the computer and the peripheral device takes place in
a parallel line of eight bits at a time. It is used to connect scanners and printers.
• USB Port: Universal Serial Bus is a new technology port which supports the connection of a variety of devices
like scanners, printers, keyboard, cameras, speakers, etc. to the computer. It is much faster than serial or parallel
ports. Smartphones, Tablets, e-book readers use USB port for charging.
• Ethernet Port: Ethernet Port provides a network connection by connecting the ethernet cables to the computer
for network and Internet connectivity using wired technology.
• HDMI Port: High Definition Media Interface port is used to connect high quality audio and video devices like
MP3 players, cameras, smart phones, Tablets, Smart TV to computers. It helps in the transmission of good
quality audio and video files.
• Power Port: It is used to connect the system to the power supply.
ICT Skills-I 85

