SSD vs HDD? SSD is the acronym for Solid State Drive or what is the same solid state drive. This term is used to name the new generation of storage devices for PCs . In contrast to hard disk drives , a memory consisting of semiconductors is used to store information similar to what you can find in other devices such as USB stick or memory cards of digital cameras. SSD vs HDD
SSDs come to overcome many of the problems we encountered with traditional hard drives:
SSD vs HDD? Deferred read / write times. On rigid hard disks these rotate continuously and the heads move angularly. This implies that all information is not accessed at the same speed.
The time depends on how far away the data from the heads are at the moment you want to access them. This may seem like a trivial problem, it is not. If a file is not stored contiguously on the disk it will be necessary to perform several jumps in order to be able to read all the information. This is why the performance of conventional disks suffer so much if you do not perform a defragmentation from time to time, which is nothing more than to sort the data of each of the files.
Reliability. Their functioning makes them vulnerable to movements. Even in the older units had to park, ie leave fixed, the heads if you were not going to use the hard drive to prevent them from damaging the dishes.
SSD vs HDD ? This is no longer necessary but still they still have problems with bumps and vibrations.
How does a SSD hard drive work? SSD vs HDD
These have two memory areas, one in which all information is saved even if it does not have electrical current and another, much smaller, which acts as a cache accelerating access. All this system is governed by a controller that acts coordinating the different elements.
What do I get when I buy an SSD hard drive?
The advantages over a traditional hard disk are several:
Speed. Both in the search of the data and in the subsequent readings. In a unit of this type the time you have to wait until you get the data flow is always the same. It is not necessary to defragment as the data is contiguous or not, the units work just as well.
Increased resistance. Having no mobile components respond better to both vibrations and blows. Ideal for devices that are to be carried on.
Lower consumption. They need less power to function. This makes them ideal for portable devices, plus it means that they wear less because of the heat and therefore their useful life increases.
Less noise. Another advantage of not having moving parts.
Are there any disadvantages to SSD hard drives?
Traditional hard disk technology has been in use for decades, which has made it possible to create very economical devices. SSD disks appear as the solution to many problems but have the disadvantage that they are very expensive.
Their only problem aside from its price is that SSD hard drives due to their mode of operation tend to be faster when they start to use and they are losing speed over time. This, which was a serious problem in the first generations, seems to be no longer so much.
Are all SSD hard drives the same?
No, and also given their variety can be classified in several ways.
Answering your connection to your PC:
PCIe SSD. On a PCIe SSD drive, the drive connects to a PCI Express port as if it were an additional internal card. This way they can work much faster and not be limited by the SATA standard .
Sata SSD. Uses the same connector as a normal hard drive. It is your only option if you want to add an SSD to a laptop or laptop .
Taking into account the technology used in its manufacture:
The information in any computer system is stored as a string of ones and zeros. Each of these elements is what is called a memory bit.
In the first SSDs each occupied a cell and with each new generation it is tried to add more per cell thus reducing the price necessary to achieve the same capacity.
This has some side effects, these memories have a shorter life cycle because the electrical voltage levels in each cell are closer. According to this classification we have the following models:
SLC. An acronym for Single Level Cell. It is the first one that was used. We have one bit per cell. At present we can see them in server environments due to its high price.
MLC. Acronym for Multi Level Cell. We have two bits per cell. They can store four states.
TLC. An acronym for Triple Level Cell. We have three bits per cell. They can store eight states.
Advantages and Disadvantages of SSD Hard Drives
Its main feature is that it is capable of storing the information even when it has no electrical current which makes it the one in charge of storing the data in the long term and of starting the PC.
Hard drives called rigid drives have been used for years, which are made up of several plates on which magnetic information is stored. To access them it is necessary to use reading heads and that the dishes turn very fast.
However for some time we have some discs called SSD which use inside very similar components to those that you can find in the flash memories like USB pencils which makes them have some interesting characteristics.
Having no moving parts like hard drives have many interesting advantages:
Silent. They do not emit any sound. It may be what you are looking for to use it on a classroom computer, like HTPC , to play movies.
Faster. One of the problems of traditional hard disks is that they need the dishes to rotate continuously so that the information you want to acquire reaches the heads. This makes the speed of reading depends on how this information is distributed, the problem is aggravated if the data is not located continuously. On SSD disks this does not happen.
Its ability to accelerate readings of information scattered around the disk makes it ideal for improving the startup of both the operating system and applications.
Less consumption. Another additional advantage of having no moving parts.
More resistant to shocks. In traditional hard disks due to the proximity of the heads to the disks these could stop working if the equipment received many shocks or vibrations, in the SSD this simply does not happen.
This as you understand them makes them ideal for laptops or any equipment that you are going to use in mobility.
SSD hard drives are called to be a small revolution in the PC world. Unfortunately they are still not cheap enough to be able to displace conventional hard disks but it is getting closer and closer.
We are facing a relatively new technology so we are getting more and more details about it. Here’s a list of ten curiosities you probably do not know about SSD hard drives.
1. They have no moving parts. This is perhaps the most obvious. Inside an SSD hard drive you will find small memories similar to those of USB storage devices . This means that they are less noisy, require less energy and are less degased than a conventional one.
2. Although they are called hard disks do not have disks inside. They are called disks because they perform the same task of a conventional hard disk but inside you will only find electronic circuits nothing like the previous technology.
3. SSD is the acronym for Solid State Drive but can also be interpreted as Solid State Disk. In other words, solid state drive or disk. It is more correct to call it a unit since as I told you earlier inside you can not find anything like a disk.
4. Reduce your benefits over time. SSDs use a type of memory called NAND to work. This has among its properties the capacity to store the information even if they are not connected to the electric current which is ideal to function as a storage device. The problem is that when we want to write something in this memory we must first reset the whole block on which we are going to perform the operation
Depending on the type of NAND that we use we will have a maximum number of such reset that can be done before the hard disk begins to fail. This is one of the reasons why SSDs carry much more memory in the interior than they offer the user, to be able to manage it in case of failures.
5. Not all are the same. For simplicity we can make two types of classifications. According to their connection to the PC exist PCIe SSD , which are connected to the motherboard , and SATA connecting Like the previous devices, if we look at the manufacturing technology of the memory which are compounds have SLC, MLC and TLC .
6. You actually have blocks of memories forming a RAID. Several hard drives are used in a RAID system to store information. If we have a configuration in RAID 5 using three disks with blocks of two megs and we want to record a file of four megs in the first one we will write two, in the second two others and in the third information that allows us to recover the information if it stops functioning one Of the discs.
If we write in this system we can write on several disks at the same time, the same thing happens with the readings. In this way we can multiply the speed of the disk and also gain in fault tolerance.
Inside an SSD you will find several NAND blocks that will be connected forming a RAID. This gives us greater speed and greater resistance to failures.
7. The RAM is much faster. Although there are SSDs that can reach the maximum of a SATA III that is to say the 600 MB / s. The RAM DDR3 slower are over 10 times faster than a SATA SSD can reach up to 30 times or even more.
8. The important thing is not its speed but the IOPS – SSD vs HDD. It is only three or four times faster in transfer speed than a conventional hard disk but over twenty times more in IOPS . This is fantastic for certain types of data since the information is very rare that it is arranged in a continuous way.
IOPS is a measure of the number of operations per second that the device is capable of performing. In a conventional hard disk is very limited because having rotating disks there is a time, which is called latency, very large that has to happen every time we want to read or write the data. None of this happens on a regular SSD hard drive.
9. Its best use is to serve the operating system and applications – SSD vs HDD. If as normal you do not have enough money to buy one in which you fit all your information do not hesitate and install only the operating system and applications.
It does not make much sense to use a disk of this type to store, for example, movies in which all information is read in a sequential way because we will not get to appreciate its speed.
10. It does not take much longer to read than to write. They are much slower to write as they have to do a memory reset as I mentioned earlier. Anyway something similar happens with almost all storage devices.
This time can be triggered because the reset has to be done at block level and not bytes so you have to rewrite even information that you have not deleted.
What are the disadvantages of SSD hard drives? SSD vs HDD
As it could not be otherwise it is not all advantages. Among the disadvantages of these devices are the following:
It is a newer technology than hard drives. This which in principle should be an advantage over traditional discs can become an inconvenience. You should keep in mind that hard drives have solved many problems that SSDs have not yet faced.
For example, the first SSD drives had certain performance issues being busier which had never happened with normal hard disks.
More expensive than normal discs. Its price is a problem since SSDs are several times more expensive. It is you who have to decide whether it is worth having it or not.
It does not speed everything up. For some it may seem obvious but you have to keep in mind that you are going to get it by buying an SSD hard drive. You’ll accelerate the startup of your computer and applications as well as the system responds faster.
SSD vs HDD? In other words, an SSD is especially noticeable when upgrading old computers, if none of the above problems happens on your computer you will not deserve to buy one.