Magnetic media uses patterns of magnetization on a material to store data non-volatilely. Early forms included wire recording in 1888 and magnetic tape in 1928. There are three main types: hard drives using rotating magnetic disks; floppy disks on flexible magnetic disks; and magnetic tape on plastic film. Hard drives have high capacity and speed but moving parts, while floppies are inexpensive but lower capacity. Tapes can store terabytes but require specialized equipment.

1. Magnetic Media Technology
Presentation by – Mritunjay Sharma

2. What is Magnetic Media?
 Magnetic storage or magnetic recording is the storage of data on
a magnetised medium.
 Magnetic storage uses different patterns of magnetisation in a magnetisable
material to store data and is a form of non-volatile memory.

3. History
 Magnetic storage in the form of wire recording—audio recording on a wire— was
publicized by Oberlin Smith in the Sept 8, 1888 issue of the Electrical World.
 The first publicly demonstrated magnetic recorder was invented by Valdemar
Poulsen in 1898.
 Poulsen‘s device recorded a signal on a wire wrapped around a drum.
 In 1928, Fritz Pfleumer developed the first magnetic tape recorder.
 In old computers, magnetic storage was also used for primary storage.
 But unlike in modern computer the magnetic storage is used for secondary
storage.

4. Types of Magnetic media?
 There are 3 types of magnetic media storage : -
1. Hard Drive
2. Floppy Disk
3. Tapes

5. HARD DRIVE
 A hard disk drive (HDD), hard drive is a data storage device used for storing and
retrieving digital information using one or more rigid rapidly rotating disks
(platters) coated with magnetic material.
 The platters are paired with magnetic heads arranged on a moving actuator arm,
which read and write data to the platter surfaces.
 HDDs are a type of non-volatile memory, retaining stored data even when powered
off

7. Feature of Hard Drive
1. Cost -
2. Capacity
3. Size
4. Speed
5. Moving Parts

8. Floppy Disk
 A floppy disk, is a type of disk storage composed of a disk of thin and
flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined
with fabric that removes dust particles.
 Floppy disks, initially as 8-inch (200 mm) media and later in 5¼-inch (133 mm) and
3½-inch (90 mm) sizes, were a ubiquitous form of data storage and exchange from
the mid-1970s into the late 2000s.

9. Advantages and Disadvantages of floppy
disk
 Advantages : -
 1) Floppies are cheap and can be used many many times
2)Floppies are easy to transport and handle
 Disadvantages : -
 1)Floppies don't have much storage capacity
2)Floppies can get affected by heat
3)They have to handle more carefully

10. Magnetic Tapes
 Magnetic tape is a medium for magnetic recording, made of a thin, magnetizable
coating on a long, narrow strip of plastic film.
 It was developed in Germany, based on magnetic wire recording.
 Devices that record and play back audio and video using magnetic tape are tape
recorders and video tape recorders.
 A device that stores computer data on magnetic tape is a tape drive.

12. Advantages of magnetic tape
 A single magnetic tape cartridge can store large amounts of data up to 1 Terabyte.
Large cartridges are used by big companies and institutions that require continuous
recording and backup of data.
 Data collection can go on without interruption overnight or for an entire weekend.
 Magnetic tape can be recorded over and reused repeatedly.

Magnetic tape is inexpensive and budget friendly.

Large amounts of information is stored.

13. Disadvantages of magnetic tape
 Special equipment must be purchased and set up for recording and storing data.
The data can only be read on the special equipment.
 If the data is stored near a strong magnetic field or a large speaker, the tape can be
damaged.

Magnetic tape has a lifespan of 15 years. Data quality gradually erodes over time.

It is necessary to keep older tape equipment just to be able to read the stored data.