For many years computer data were stored in mechanically designed hard drives and as we know the hard disk drive (HDD) consists of moving elements. It is generally used for storing and retrieving digital data and done by one or more rotating disks which are coated with magnetic materials. The platters and magnetic heads are bonded and with the help of actuator arm data read and write are performed.

The major disadvantages of HDD are that it takes more time to read, write and retrieve data because of the mechanical parts used in HDD. Some times the chances of failure are more because of rough handing of the device. HDD is also heavier as compared with Solid state drive (SSD).

Therefore SSD comes into consideration to overcome such problems. The working of SSD is completely different from HDD. In this device a simple memory chip (NAND flash memory) is used in place of rotating parts.


The concept of SSD is not new, similar technology was in practice since 1950 and at that time this technology was used in super computers, aerospace and different government organizations. The main reason for this is cost factor.  But starting of 1990, because of innovations and demands the price of SSD technology was dropped. But there was still some problem as far as size and life of SSD is concerned. After that the demand of SSD comes into picture in early 2000 with new feathers.

Now the SSD Technology is available for all types of users. Apple had launched iPod in 2005 and reported the first flash based system and successfully captured the market. EMC had added SSD technology in 2008 in symmetrix disk arrays hardware system.

At the beginning the commercially available SSD was made with multi-level cell flash technology and that was strengthen write cycles. The new company SSD is being sell that use multi level cell. SSD made from multi NAND describe the next evolution. IBM, Samsung and Toshiba, HP, Lenevo have manufactured and marketed SSD with 3D NAND and it has flash memory cells which are put together one another in vertical layers.

Present consumers and others users are adopting flash SSD because of improvements in the performance in solid state wear and falling of its prices. It is a matter of fact that SSD flash drive and HDD are expected to compete in much area for the foreseeable future.


Sl. NoSSD driverHDD driver
1.This server responds very quickly to read and write data.This server takes time to read and write data.
2.The access time is much higher approximately 35 to 100 microseconds.Compare to SSD its access time is 5000 to 10000 microseconds.
3.Read and write average speed is 200 to 2500 MB/s.Read and write average speed is 200 MB/s.
4.SSD server of high capacity is available but now days uncommon.HDD server of 1TB is easily available.
5.Any rotating element is required in SSD, therefore reliable and durable.HDD has disk rotating element and there is a chance of damage of the drive while handling.
6.Expensive now days.Comparatively less expensive.
7.It consumes less power to run.It consumes more power to run.
8.The available sizes are 1, 1.8 and 2.5 inches generally.The available sizes are 2.5 and 3.5 inches generally.


The primary memory chips of SSD are like random access memory. The files are stored on a block of NAND cells not in platters. Each block has the capacity to store between 256 KB and 4MB data. The most important part of SSD is that the controller of SSD has instant address of the grids and therefore when our Computer demands a file it is accessible instantly. The major advantages of SSD over HDD are that we do not need to wait for a read and write head to get the required information and its access time is measured in nanoseconds.

But updating data is difficult in SSD. It is essential to refresh a block or grid when any part is updated. When a data is copied from a block the data automatically erased. When we ask our system to retrieve/update data, the controller of the SSD searches at the address of the digital data requested and the reads the charge status. At the idle condition of the drive garbage collection process goes through and it must be clear that the information in the previous block is erased and free so that data can be written again. Some times the SSD skips certain data when it erases grids because a block can be rewritten many times and this process is very important to while storing data The read and write process requires movement of digital data and SSD  is generally designed with the provision with the storage. All the time there is a certain amount of the drive is not reported to the operating system of the computer and therefore they are not accessible to the operator. Thus this allows space for the drive to shift and delete data without bothering the overall storage capacity.


The following advantages are noted when we use SSD technology.

  1. Bulk data management: Companies and industries use to work with huge amounts of data and they rely on SSD to maintain access times and transfer of data speeds because they are very critical parameters.
  2. Heavy software and gaming: Gaming computers or computers with bulky software always struggling with performance of the system. The limitation of current computing technology and the expense to maintain and get benefited SSD play an important role.
  3. Handling: SSD need low power consumption as compared to HDD and this way it is contributing to better life in laptops and tablets. SSD is also shock resistant and lowers the chances of data loss in transportation.
  4. Servers: Every industry and offices need SSD server to get high speed reads and writes in order to accomplish the given task in time.


The laptop market is moving from traditional hard disk drives (HDD) to chip based solid-state drives (SSD) for various reasons as discussed above. SSD is more responsive as compared to HDD, they use less battery power; they are more durable when dropped or mishandled and they occupy less space. SSD makes actions such as loading and saving programs and files much snappier.

In computers, the hard drive is not kept rotating all the time, so as to save power and provide longer battery life. When a program executes data from the hard drive, it has to wait until the hard drive rotates up, which makes a delay in read and write the data. But in case of an SSD, it’s almost instantly available for process, no waits occur.

The only drawback of SSD is the price. SSD storage costs much more than HDD storage and the ratio used to be much higher. But In 2019 the price of it has dropped and hoping near future the price will come down more.  

  • Azbia says:

    Very technical information

  • This page truly has all of the information I needed concerning
    this subject and didn’t know who to ask. asmr 0mniartist

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