Introduction:
Storing digital information on a hard disk is a crucial aspect of computing. It involves converting and encoding data into a format that can be stored and retrieved later. The process of storing digital information on a hard disk is achieved by applying a suitable electric pulse.

Explanation:
The process of storing digital information on a hard disk involves several steps, including encoding, magnetizing, and writing data onto the disk. Let's delve into the details of how this process occurs:

Encoding:
Before the data can be stored on a hard disk, it needs to be encoded. Encoding is the process of converting analog data into a digital format that can be understood and processed by computers. This is typically done using binary code, where each piece of data is represented by a series of 0s and 1s.

Magnetizing:
Once the data is encoded, it is ready to be stored on the hard disk. Hard disks contain a series of platters coated with a magnetic material. To store information, the hard disk uses a magnetic field to magnetize tiny regions on the platters. These regions represent the 0s and 1s of the encoded data. When a region is magnetized in a particular direction, it represents a binary 1, and when it is not magnetized, it represents a binary 0.

Writing Data:
To write the encoded data onto the hard disk, a suitable electric pulse is applied. This pulse is sent to the read/write head of the hard disk, which is positioned above the platters. The read/write head consists of a coil that generates a magnetic field when an electric current flows through it. By applying an electric pulse to the read/write head, the magnetic field is generated, which in turn magnetizes the regions on the platters and writes the data.

Conclusion:
In conclusion, the digital information is stored on a hard disk by applying a suitable electric pulse. This pulse generates a magnetic field through the read/write head, which magnetizes the platters and writes the encoded data. This process of encoding, magnetizing, and writing plays a vital role in storing and retrieving digital information on a hard disk.