Technology Training

All about Hard Drives

Hard Drives are one of the most fundamental forms of data storage and processing. They were first introduced in 1956 by the company, IBM. From then on, hard drives just kept on evolving. Faster processing. Safer storage. Bigger data capacity. Those are the essential developments in hard drives.

Now, almost everyone has a hard drive, in any form or size. You  have the HDD, SSHD, Flash drive and the MicroSD cards. Each have their respective use and function and proper care is required to avoid losing your data.

In addition, the types of hard drives of today take different shapes and forms. Some of them are the following:

  • RAID
  • VMware
  • Flash Drive

Though they differ anatomically, they still serve the same purpose – Data processing and storage.



A hard drive is basically the computer’s storage. It’s responsible for processing and storing data. A hard disk drive is responsible for storing all the user’s data for the long term. This is not only limited to things saved but also data needed for your operating system to function properly such as drivers that allow you to connect to the internet and more.

There are four types of hard drives  and they are the PATA, Serial ATA, SCSI or Small Computer System Interface, and SSD or Solid-State Drive. One of the earliest hard drives made use of PATA or Parallel Advanced Technology Attachment which refers to the type of interface used to connect the hard drive to the computer.  The used 40 or 80 wire ribbon cables and can transfer data in 16 bit pockets simultaneously in parallel. The system of the PATA will also be the base science for the more modern drives.

SATA drives have replaced PATA due to better performance. They transfer data faster (150 up to 600 megabytes per second) opposed to PATA ( 133 megabytes per second), use less power (250mV opposed to 5V) and SATA cables are thinner and more flexible.

SCSI or Small Computer System Interface allows for the connection of different peripheral devices such as hard drives, printers, scanners, CD-Drives and more. SCSI drives can also be connected internally and externally.


SSD or Solid-state Drives One of the latest types of hard drives that do not consist of moving parts. This makes them less susceptible to damage. They make use of flash memory chips instead to store data and provide faster data access. They are very common in laptops nowadays. SSDs are also used for mobile transfers. This also has general compatibility like the flash drive. An additional wire is used to make it compatible to other devices.


SSDs are one of the fastest types of hard drives and storage options out there with data transfer speeds ranging up to 550 megabytes per second or higher. The absence of moving parts also allows for more durability and eliminate the possibility of corrupt data or decreased performance due to vibrations or shock. These drives can also allow for access of data in a fraction of a millisecond therefore allowing shorter boot times, application launches and overall a faster system.

Magnetic hard drives such as ATA and SATA drivers make use of rotating magnetic disks called platters and a mechanical arm that reads and writes data using a magnetization process. Data is stored on circular divisions of the disks called tracks which are divided into sectors that contain the blocks of data. Though they may be slower than the SSD, they are more affordable and have a higher capacity.


HHDs are a combination of the previous two making use of platters and flash memory. Hybrid drives store the most frequently accessed data to flash memory which allow faster speeds on these files while the rest is stored in the platter. In terms of price, they are pricier than magnetic hard drives but far cheaper than the SSD.


RAID or Redundant Array of Independent DisksIs basically storing of data on multiple hard drives. It is used for data backup in case one hard drive fails like a hard drive short DST check failed. It is also used for increased performance and increased storage functions.

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