What is a HDD?

HDD stands for hard disk drive. It is a piece of hardware that stores data on disks with magnetic surfaces. What this means is that the HDD can read and write information to the disks, and store a lot more data than what is possible in an SSD (solid state drive). HDDs are primarily used in personal computers because they cost less than flash storage devices like SSDs.

How HDDs Work?

The HDD is composed of a central processing unit (CPU), a hard disk that contains the storage space for your data, and circuits.

When you want to retrieve data, the CPU performs a mathematical calculation to locate the desired data on the hard disk.

It then converts it into an energy wave that is transmitted by a magnetic head. The magnetic head reads and processes this information before passing it on to other components for processing.


There are several different ways to categorize the differences between HDDs and SSDs:

  • HDD disks store data magnetically, while SSDs store data electronically. This means that HDDs can read and write information to the disks because the disks have a magnetic surface, but SSDs can’t do this because they don’t have one.
  • HDDs typically come with larger storage capacities than SSDs because they use a spinning disk which stores more information than an SSD.
  • HDDs have a higher latency rate than SSDs, which means that HDDs get slower the more you use them because data is stored on disks and not in flash memory like with an SSD. This also makes reading from the disk take longer for HDDs when compared to writing onto it.
  • Finally, HDDs are more reliable than SSDs because they’re not as sensitive to the environment and have no moving parts.

Different Types of HDDs

There are five types of HDDs: SAS, SATA, PATA, IDE, and SCSI.

The first three of these are the most commonly used for personal computers because they’re cheaper than the other two when in comparison to capacity. These three disks also have a better performance rate than the latter two, making them more efficient to use.

However, PATA is falling out of favor as its rate of data transfer is much slower than that of SATA.

IDE was one of the first disk types available on PCs and it’s still being used today because it can read both data stored on disks and from flash memory.

SCSI was invented by IBM as a way to expand storage space with little effort; it’s not used as much anymore because it requires more time to read the data off of a disk.

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