Storage Devices – how data are stored in HD, CD/DVD and Pen-drive?

Summary

In this video, the process of how digital data, like images, is stored on various storage devices is explained. It begins with the concept of binary code (ones and zeros), emphasizing that data is not stored as physical images but in binary form. The video details how hard disks use magnetic particles, CDs use lands and pits created by lasers, and pen drives use transistors to store data. Despite differences in storage methods, the core binary code remains the same across all devices, illustrating the consistency of digital data storage technology.

Takeaways

• 😀 Data is not stored as actual images or files on devices but as binary code (1s and 0s).
• 😀 A picture on your desktop, for example, is stored as binary code on your hard drive, not as a physical picture.
• 😀 The binary code for a picture is a complex sequence of 1s and 0s that represents the image digitally.
• 😀 The process of storing binary data on a hard drive involves arranging tiny magnetic particles in a specific order.
• 😀 Each hard disk is made up of multiple platters, and the data is stored using the arrangement of magnetic particles on these platters.
• 😀 In a CD, binary data is stored through laser light creating smooth or raised surfaces to represent 1s and 0s.
• 😀 The method of storing binary data differs across devices, such as hard disks, CDs, and pen drives, but the binary code remains the same.
• 😀 On CDs, smooth areas represent a 1, while raised areas represent a 0, based on how laser light interacts with the disc.
• 😀 Pen drives use transistors to store binary code, a different method compared to hard disks or CDs but still based on the same binary principles.
• 😀 Despite different storage media, the underlying binary code for data remains consistent, with the representation method varying by device.
• 😀 Understanding binary code is essential for grasping how computers and other electronic devices store data.

Q & A

How are files stored on devices like a computer or USB drive?

Files are stored as binary code, which is represented by 1s and 0s. Different devices use various methods to store this binary code, such as magnetic particles in hard drives, laser pits and lands in CDs, or transistors in flash drives.

What is the role of binary code in data storage?

Binary code is the fundamental language used by computers to represent data. Everything from images to documents is converted into binary code, which consists of 1s and 0s. This binary code is what is actually stored on storage devices.

What is the difference between the image on your desktop and the physical location of the data?

When you see an image on your desktop, it's not physically stored there. Instead, it is stored on your computer’s hard disk as binary code. The desktop simply serves as a link to that data.

How are images stored on a hard disk drive?

On a hard disk, data is stored using magnetically sensitive platters. Magnetic particles on the surface of these platters are arranged in specific patterns to represent binary code. This binary code corresponds to the image or other data stored.

What is the relationship between magnetic particles and binary data in a hard disk?

Magnetic particles on the surface of a hard disk can have two poles, north and south. These particles are arranged in specific patterns to represent binary 1s and 0s, which ultimately encode the data (like an image).

How does a CD store data differently from a hard disk?

A CD stores data using laser technology. The surface of the CD is smooth initially, but a laser creates small pits, which represent binary 0s, while smooth areas (called 'lands') represent binary 1s. This is different from the magnetic particles used in hard disks.

What do the terms 'pits' and 'lands' mean in the context of a CD?

'Pits' are indentations created by a laser on the surface of a CD, and they represent binary 0s. 'Lands' are smooth, unaffected areas that represent binary 1s. These pits and lands together encode the binary data on the CD.

Why is binary code the same across different storage devices?

The binary code representing data remains the same across devices; what changes is the technology used to represent the 1s and 0s. For example, hard drives use magnetic particles, CDs use laser pits, and flash drives use transistors, but the underlying binary code is always the same.

What happens when binary code is stored on a flash drive?

On a flash drive, binary code is stored using transistors, which can represent the 1s and 0s by switching between different electrical states. This is different from the magnetic and laser-based methods used in hard drives and CDs.

Can you explain the analogy used to explain binary code and religion?

The analogy compares the storage of binary code across different devices to how different religions use different names for the same concept. Just as the underlying idea (the god) remains the same despite the different names, the binary code remains the same regardless of the storage medium, with the technology used to represent it being different.