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Pen Drive
A pen drive is a small, portable data storage device that uses flash memory and
is integrated with a USB (Universal Serial Bus) connector. It acts as a portable
storage device and is easy to use, as it is small enough to be
carried in a pocket or on a keychain. It can be plugged into any
computer or device with a USB port. Flash drives come in various
storage capacities, ranging from a few megabytes (MB) to several
Pen drive
terabytes (TB), with common capacities up to 1 TB or more.
Memory Card
It is commonly known as a multimedia memory card. It is very
small in size, usually 1–1.5 inches. These are used in mobile phones
and digital cameras. You need to have a card reader to read the
data stored on the memory card. Memory card
Solid State Drive (SSD)
An SSD is a type of storage device that holds information, like your pictures, games,
and documents. An SSD uses the technique of flash memory to store data. It is much
faster than a hard disk. SSDs are more durable and reliable than hard disks. They
come in various capacities, typically 128 GB to several
TBs. Nowadays, desktop computers and laptops come
with SSD instead of traditional hard disk.
SSD
MEASURING THE COMPUTER’S MEMORY
The basic unit for measuring the memory of a computer is byte. A byte consists of
a group of eight bits, for example, 10001011, i.e., 1 byte equals 8 bits. A group of 4
bits is known as a nibble (half a byte), for example, 1001 i.e., 1 nibble equals 4 bits.
Other units for measuring the computer’s memory are kilobyte, megabyte,
gigabyte, terabyte, and so on.
1 Kilobyte (KB) equals 1024 bytes.
1 Megabyte (MB) equals 1024 KB.
1 Gigabyte (GB) equals 1024 MB.
1 Terabyte (TB) equals 1024 GB.
1 Petabyte (PB) equals 1024 TB.
1 Exabyte (EB) equals 1024 PB.
1 Zettabyte (ZB) equals 1024 EB.
1 Yottabyte (YB) equals 1024 ZB.
Computers—Storage and Memory Device 11

