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l Pen/Flash Drive: It is small in size, handy and is a detachable device from which
data can be read, copied or transferred from one system to another. It is
re-writable and weighs less than 25 grams. Nowadays, pen drives are the most
commonly used external storage and data transferring devices. It has an
attachment slot which can be easily inserted or attached into the computer’s
USB (Universal Serial Bus) port.
Memory Stick: Memory Stick is a detachable flash memory card device that
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was launched by Sony in 1998. The data stored in memory card can be read
or written with a memory stick (typically a small box that connects via USB
or some other serial connection). Memory Stick supports memory card of
different storage capacities and helps in faster transfer of data.
UNITS OF STORAGE
A computer understands only binary language. All the data and information that are fed into a
computer are converted into its own (machine) language. Its language consists of two digits, i.e., 0
and 1 which are known as Binary Digits. Each digit i.e. 0 or 1 is known as a Bit. A group of four (4)
bits is called a Nibble. A group of eight (8) bits is called a Byte. Conventionally, byte is also known
as the word length of computer. Storage of data is measured in multiples of bytes. Different units of
storage of data are:
No. of bits/bytes Equal to
8 bits 1 Byte
1024 Bytes (B) 1 Kilobyte
1024 Kilobytes (KB) 1 Megabyte
1024 Megabytes (MB) 1 Gigabyte
1024 Gigabytes (GB) 1 Terabyte
1024 Terabytes (TB) 1 Petabyte
1024 Petabytes (PB) 1 Exabyte
1024 Exabytes (EB) 1 Zettabyte
1024 Zettabytes (ZB) 1 Yottabyte
1024 Yottabytes (YB) 1 Brontobyte
1024 Brontobytes (BB) 1 Geopbyte
28 Touchpad Computer Applications (Ver. 2.0)-IX

