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✶ Memory Card: It is commonly known as multimedia memory
card. It is very small in size. It is used in mobile phones and digital
cameras. You need to have a card reader to read the stored data
on memory card. It has a storage capacity up to 2 TB.
Memory card
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 to 8 bits. A
group of 4 bits is known as a nibble (half byte), for example, 1001. Other units for
measuring the computer’s memory are kilobyte, megabyte, gigabyte, terabyte, etc.
✶ 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.
Recap
RAM and ROM are the two types of primary memory.
The data and instructions that are entered into the computer using input devices
are stored inside the memory.
The basic unit for measuring the memory of a computer is byte.
Magnetic disc, Optical disc and flash drive are the three categories of Secondary
memory.
Exercise
A. Tick ( ) the correct option.
1. Which one of these is not a secondary storage device?
a. RAM b. DVD c. Pen drive
2. .................... equals 1024 PB.
a. 1 MB b. 1 EB c. 1 TB
16 Modular (Ver. 2.1)-III

