Memory units are the types of storage units in which the computer stores information Like we remember people by their names and books by their labels; similarly, computer remembers data in the form of memory units. Memory units are of the following types.
Binary Digit (Bit)
Binary digit is the smallest unit of data in a computer. Computer stores data in the form of binary digits, 0 and 1
It can also be called as a bit.
1 bit = 1 binary digit. 0 or 1
A byte is the smallest unit which can represent a data item or a character.
The following are the various units of computer memory measurements;
Bit, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte, Zettabyte, Yottabyte, Brontobyte, Geopbyte
8 Bits – 1 Byte
1024 Bytes – 1 Kilobyte (KB)
1024 Kilobytes – 1 Megabyte (MB)
1024 Megabytes – 1 Gigabyte (GB)
1024 Gigabytes – 1 Terabyte (TB)
1024 Terabytes – 1 Exabyte (EB)
1024 Exabytes – 1 Zettabyte (ZB)
1024 Zettabytes – 1 Yottabyte (YB)
1024 Yottabytes – 1 Brontobyte
1024 Brontobytes – 1 Geopbyte
Geopbyte is the highest memory of the computer.
Computer is a machine which can store and remember the information or data easily. It keeps the data stored forever. It gets deleted only when you delete it from the computer memory.
The computer memory is used to store all the instructions given by the user. It stores files, Documents, Music, Folders, Images, and also different types of software.
Computer Memory of two types –
- Primary Memory
- Secondary Memory
Primary memory is an in-built memory. It is of two types –
- (ROM) Read Only Memory
- (RAM) Random Access Memory
(ROM) Read Only Memory
ROM is non-volatile or non-erasable memory. It means the data stored on ROM is permanent. The data once recorded on ROM does not get deleted even if the computer is turned off or the electricity supply is interrupted. There are three basic types of ROM –
- (PROM) Programmable Read Only Memory
- (EPROM) Erasable Programmable Read Only Memory
- (EEPROM) Electrically Erasable Programmable Read Only Memory
(RAM) Random Access Memory
RAM is volatile or erasable memory. It means the data stored on RAM is temporary and it gets deleted when the computer is turned off or if the electricity supply is interrupted. There are two basic types of RAM –
- (DRAM) Dynamic Random Access Memory
- (SRAM) Static Random Access Memory
Secondary memory is the external memory. A computer has limited internal memory. It cannot save all the work that we do for a long period of time. We need to save our work in external storage devices, that is, secondary memory devices. Some of the common storage devices are explained below.
Hard Disk (External and Internal)
A hard disk drive, hard disk or hard drive is a data storage device that uses magnetic storage to store and restore digital information for usage. (Hard Disk Drive) Hard Disk Drive – Storage Capacity 40GB, 120GB 360GB, 1TB, E.T.C.
CD (Compact Disk) allows up to 700MB of data storage. Most of the CDs allow one-time recording. CR-R (Compact Disk-Recordable). CD-RW (Compact Disk-Rewritable) allow to delete and rewrite the data on it.
DVD (Digital Versatile Disk) allows up to 5 GB of data storage.
Most of the DVDs allow one-time recording. These DVDs are called DVD-R. The Rewritable-DVDs (DVD-RW) allow to delete and rewrite the data on them.
Flash Drives (Pan Drive)
A Flash Drive, also known as USB (Universal Serial Bus) Drive, USB stick, thumb drive, pen drive, etc. is a data storage device. USB (Universal Serial Bus)
Blue-ray or Blu-ray Disk (BD) is a digital optical disk. It allows up to 20 to 50 GB of data Storage.