HDD vs SSD: Differences and Advantages of Both Types of Hard Disk


Today we are going to tell you what are the differences between hard disks HDD or SSD .For that, in the first place we will begin by describing in a simple and basic way what are the general features of both mechanical hard disks or HDDs or hard disks in solid state or SSD, so that you can easily recognize them.

Then we will go on to see a comparative table with the main characteristics of one and the other.Finally we will finish telling you on what occasions it is recommended to use the HDD or SSD.

Hard drive or HDD (Hard Drive Disk)

Hard drives, also known as HDD, are a computer component that serves to permanently store your data. This means that the data is not cleared when the unit is turned off as it is stored in the RAM. The first company to market them was IBM in 1956.

They are composed of mechanical parts, hence they are sometimes called mechanical hard drives, and they use magnetism to record your data and files . It consists of one or more hard drives connected by the same axis and rotating at high speed inside a metal box. On each plate and on each of its faces, a read / write head reads or writes your data on the disks.

The finer the discs the better the recording, and the faster they spin the faster the data is transmitted , both when reading and writing. Generally, the speed of the hard disks usually is of 5400 or 7200 RPM (revolutions per minute), although in some discs based on servers can reach up to 15,000 RPM

As for the size, the boxes of the mechanical hard disks can be of 2,5 “or of 3,5”. Their price may vary depending on this size, but most of all their storage capacity. In fact, the big advantage of these hard disks with respect to the SSD is that they are quite cheaper .



Solid State Drive or SSD

Solid State Drives (SSDs) are an alternative to hard drives. The big difference is that while the hard drives use moving mechanical components, the SSD stores the files in microchips with flash memory interconnected with each other . Therefore, we could almost consider them as an evolution of USB memories.

SSDs typically use NAND-based flashes, which are also non-volatile, and keep the information stored when the disk is disconnected. They do not have physical heads to record the data, instead they include an integrated processor to perform operations related to reading and writing data.

These processors, called controllers, are the ones who make the “decisions” on how to store, retrieve, cache and clean data from the disk, and their efficiency is one of the factors that determine the total speed of the drive . In addition, by not depending on the rotation of a physical component, also a quieter unit is achieved than the mechanical disks.

As for the size, these disks are usually 2.5 “, and have a design almost identical to that of mechanical hard disks, which helps them fit into the same housings and slots where conventional hard disks are mounted in a computer.



HDD vs SSD: Main Differences

CAPACITY Overall between 256 GB and 4 TB Generally between 1 and 10 TB
CONSUMPTION Lower consumption Greater consumption
COST Quite more expensive Much cheaper
NOISE Quieter due to no moving parts Something noisier to have moving parts
VIBRATIONS Does not vibrate because there are no moving parts Turning your discs may cause slight vibrations
FRAGMENTATION Does not have Can occur
DURABILITY Your cells can be rewritten a limited number of times With mechanical parts that can be damaged by movement
OS BOOT TIME 7 seconds 16 seconds
DATA TRANSFER In general, between 200 and 550 MB / s Overall between 50 and 150 MB / s
AFFECTED BY MAGNETISM Do not Magnetism can delete data

In this table you can see the main differences between the two storage technologies. The main difference has to do with maximum capacities and price . Keep in mind that SSDs are much more modern, so it is normal that their price is significantly higher. To date, a 220 GB SSD can be worth the same as a 3 TB HDD.

Because they are storage units without moving parts like their predecessors, SSDs have some notable advantages such as lower noise and vibration. It should also be made clear that we can not say that mechanical hard disks are also extremely noisy, so it is a not so important difference.

The one that is a notable difference is that of speed. In our comparison between the two technologies, we saw how an SSD started an operating system in less than half the time of a HDD of 7,200 rpm, and that it vastly tripled its data writing and reading speeds . In our test we used a HDD that read and write data at 150 MB / s, and an SSD that read and write at 545 MB / s and 525 MB / s.


Which hard drive to choose?

If you usually download a lot of Internet content and need large amounts of storage , or if you have a low budget, it is recommended that you continue to use HDD. They are also a good resource for external hard drives, where storage capacity above speed usually prevails.

SSDs are recommended if you want to have a much faster computer . In fact, its speed can make a PC with a few years go much faster without having to invest in other components. It is also recommended if you usually work in the editing of multimedia content or you are a lover of video games, as the loading processes will accelerate thanks to them.

In most cases however it is advisable to combine both types of hard disk . In a home tower, for example, you can use an SSD on the C: disk to install there the operating system and go all faster. You will be accompanied by a HDD as a secondary disk and you will have a perfect unit in which to store all the heavy files that you have in the computer.

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