Hard disk | Specifications | Types | Difference

Hard disk, Magnetic storage medium for a microcomputer. Buy Refurbished Hard disks are flat, circular plates made of aluminum or glass and coated with magnetic material. 

Hard disks for personal computers can store up to several gigabytes (billions of bytes) of information. Data are stored on their surfaces in concentric tracks.

Functions of a Hard Drive?

 

The Hard Drive as Storage

As you use your computer, you create documents and other bits of information to be stored. The hard drive saves these items, alongside the software and files that allow you to easily use and interact with your computer, including the operating system.

When you open an application or document, your computer accesses it from the hard drive. Larger files or programs can take longer to access because the computer needs to retrieve the information from the hard drive before presenting it to you in a useable way.

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Measuring HDD Storage

Hard drives come in a variety of storage sizes. As of publication, hard drives are typically measured in gigabytes and terabytes, which are units of measurement for a hard drive’s storage capacity.

For example, 500GB hard drives are common in many modern computers. The average four-minute song on iTunes is approximately 4MB in size. There are 1,000 megabytes in 1 gigabyte. This means that a computer with a 500GB hard drive could store 250,000 songs.

Types

Standard Hard Disk Drive

A hard circle drive comprises of round metal plate formed platters that store the PC’s information. An actuator arm runs between the platters, perusing information off the hard drive. These platters continually turn while the PC is on, practically like a vinyl phonograph. HDDs are the most widely recognized and cheap type of hard drive.

Solid State Drive

Unlike a hard disk drive, a solid-state drive has no moving parts and the data is stored on flash memory chips instead of metallic platters. SSD technology is faster than HDD and less prone to failure since there are no moving parts. Since SSDs are a newer technology, they cost more per unit of storage than an HDD.

The Non-Similarities Between a Megabyte and a Gigabyte

An early exercise for PC designing understudies is how PCs handle information. This exercise manages the major unit of PC information known as a piece. These single units join to shape bigger units, permitting PCs to share more mind-boggling (bigger) measures of data. Eight pieces are stacked together to structure a byte, which is the rule information size PCs use to speak to and store your documents and projects as megabytes and gigabytes.

Bytes Vs Bits

Computers communicate using binary digits orbits. Binary digits express values using the numbers 0 and 1 as opposed to decimal digits which use numbers 0 to 9. Since a bit alone cannot represent enough data to be useful to humans, bits are grouped, eight at a time, to form a byte. 

In other words, two bytes are equivalent to 16 bits, and three bytes the same as 24 bits. The more complex a document or application is, the more bytes are required to represent and store it in a computer.

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Prefixes

Modern computers deal in very large amounts of bytes. For example, when purchasing a new computer, you will always note the size of its hard drive expressed in gigabytes. Here, “Giga” is the prefix but there are many others such as “kilo,” “mega” and “tetra”. 

Byte prefixes have origins in the Greek or Latin languages but have a numerical value in computer language. The prefix kilo, also used in the metric system, denotes 1024 bytes or a kilobyte. The number isn’t exactly 1,000 because bytes are based on the binary system (0 and 1) where 2^10 = 1024.

Megabytes versus Gigabytes

Megabytes and gigabytes, like the kilobyte, are magnitudes of bytes. Basically, a gigabyte is larger than a megabyte. The difference is similar to that between one billion and one million, respectively. 

For example, when you buy a computer with 500 GB, this means it can store approximately 500 billion bytes of information. A typical MP3 file may take up 5 MB or about 5 million bytes of that space. The exact numerical value for a megabyte is 2^20 (1,048,576) and a gigabyte is 2^30 (1,073,741,824).

Terabytes and Further 

Theoretically, there is no limit to the size of a byte because numbers are infinite. Practically, however, computer hardware does have technical limits and the more powerful a computer is, the more expensive it becomes. Though, because consumer data — music, movies, pictures — is increasingly stored digitally, there is a growing demand for larger hard drives. Terabyte (2^40 = 1,099,511,627,776) hard drives were rarely heard of 10 years ago but are affordable as of the time of publication, costing less than $150. Beyond the terabyte is the petabyte (2^50) and the exabyte (2^60) and so on.

Which is better SSD or HDD

HDDs are a legacy storage technology that use spinning disks to read/write data. SSDs are faster and more power-efficient than HDDs. HDDs are priced lower, but SSD prices are dropping.