What is Hard Disk Drive ?

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Hard disk drives (also called hard drives or disk drives) is the mechanism that reads and writes data on a hard disk.

Hard disk drives (HDDs) for PCs generally have seek times of about 12 milliseconds or less

. Many disk drives improve their performance through a technique called caching.

There are several interface standards for passing data between a hard disk and a computer. The most common are IDE and SCSI.

Hard disk drives are sometimes called Winchester drives, Winchester being the name of one of the first popular hard disk drive technologies developed by IBM in 1973.

The hard disk drive is the main, and usually largest, data storage hardware device in a computer

The operating system, software titles, and most other files are stored in the hard disk drive.

The hard drive is sometimes referred to as the "C drive" due to the fact that Microsoft Windows

While this is not a technically correct term to use, it is still common

A few of the most popular hard drive manufacturers include Seagate, Western Digital, Hitachi, and Toshiba.

A few of the most popular hard drive manufacturers include Seagate, Western Digital, Hitachi, and Toshiba.

A hard drive is usually the size of a paperback book, but much heavier.

The sides of the hard drive have pre-drilled,

The sides of the hard drive have pre-drilled, threaded holes for easy mounting in the 3.5-inch drive bay in the computer case.

The hard drive is mounted so the end with the connections faces inside the computer.

Unlike volatile storage like RAM, a hard drive keeps a hold of its data even when powered off.

This is why you can restart a computer, which powers down the HDD, but still have access to all the data when it's back on.

Inside the hard drive are sectors located on tracks, which are stored on rotating platters.

These platters have magnetic heads that move with an actuator arm to read and write data to the drive.

The computer hard drive isn't the only kind of hard drive

What's more is that there are many different sizes of hard drives, some very small and others rather large.

Another USB hard drive is the external hard drive,

a regular hard drive that's been put into its own case so that it's safe to exist outside the computer case