Memory is divided into primary and secondary memory. Primary memory, also called main memory, is used for immediate data access by the processor and includes RAM and ROM. RAM is temporary storage that allows direct CPU access while ROM is permanent storage that retains data without power. Secondary memory provides permanent mass storage on devices like hard disks, and includes examples like magnetic tapes, floppy disks, USB drives, and solid state drives that retain data without power.

1. CATEGORY OF MEMORIES
By Nouman Baloch

2. Types of memory in computer
 Memory is divided into two big clusters.
 1) Primary Memory
 2) Secondary Memory

3. Primary Memory
 Primary Memory (also called main memory),
is used for immediate access of data by the
processor.
 Primary memory further divided into two
types.
 1) RAM(Random Access Memory)
 2) ROM(Read Only Memory)

4. RAM (Random Access Memory)
 RAM is a memory within the computer
responsible for storing data temporary . CPU
can access data directly from RAM .It is
volatile in nature, which means that data will
be erased once supply to the storage device is
turned off.

5. ROM (Read Only Memory)
 Unlike RAM, ROM is a permanent form of
storage. ROM stays active regardless of
whether power supply to it is turned on or off.

6. Secondary Memory
 Secondary memory is available on mass
storage devices for permanent data storage.
Data stored on a secondary device is retained
even when it is not supplied any power. Some
examples of secondary memories are given in
next slide.

7. Examples
 1) MagneticTape 2) Floppy Disk
 3) Hard Disk 4) USB Pen Drives

8. Magmatic Tape
 Magnetic tape data storage is a system for
storing digital information on magnetic
tape using digital recording

9. Floppy Disk
 What became the most common format, the
double-sided, high-density (HD) 1.44 MB disk
drive, shipped in 1986.The first Macintosh
computers use single-sided 31⁄2-inch floppy
disks, but with 400 KB formatted capacity

10. Hard Disk
 A hard disk drive (HDD), hard
disk, hard drive, or fixed disk, is an
electromechanical data storage device that
uses magnetic storage to store and retrieve
digital information using one or more rigid
rapidly rotating disks (platters) coated with
magnetic material

11. SSD(Solid State Drive)
 SSDs are sometimes referred to as flash
drives or solid-state disks. Unlike a hard disk
drive (HDD), an SSD has no moving parts to
break or spin up or down.

12. USB(Universal Serial Bus)
 A USB flash drive is a device used for data
storage that includes a flash memory and an
integrated Universal Serial Bus (USB)
interface. Most USB flash drives are
removable and rewritable.

13. Any
Question
please ask?