What are SSD and various features explained

What is SSD?

Solid State Drive or SSD is new gen storage device used in Desktop PC, Laptop. SSDs are fast and shock proof. We know about disk based drives. Disk drives uses mechanical moving parts for reading and writing data. Hence, it is slow. But SSDs are fast flash based devices. Even mobile phones run on flash. So, they are faster than Desktop PC or Laptop.


What is NAND Flash memory?

Flash Memory is non-volatile memory that uses memory cells. These memory cells are MOSFET or Transistor. It uses NAND or NOR floating gate for data storage. NAND based devices are high capacity and cost-effective. Moreover, it does not need constant power for data storage. NOR gate are opposite of these features.

Difference between SSD and HDD

Clearly, SSDs are better in every aspect. Endurance depends on our usage. For light office work, accounting and web browsing, it is a must. Any SSD will easily survive 4-5 years and give blazing speeds. For heavy users, a SSD with high endurance will be better. This will ensure enhanced upgrade and life.

What are the memory types in SSD?

We have four memory types inside SSD. These are Single Level Cell (SLC), Multi Level Cell (MLC), Triple Level Cell (TLC), and Quad Level Cell (QLC). They differ in packing memory in cells. So, read and write speed differs.

What are the types of SSD?

SSDs vary as per their Form Factor, Interface and Speed.

Most common type of SSDs are 2.5 inch and M.2. The 2.5 inch is the width of the SSD. Normal 2.5” inch dimensions are 100 mm * 69.5 mm * 9.5 mm. The width 69.5 mm is roughly 2.5 inch.

M.2 SSDs vary in length and width too. M.2 module includes width in 12, 16, 22 and 30 mm. Lengths of M.2 drives can be 16, 26, 30, 38, 42, 60, 80 and 110 mm. Most common type of M.2 has Length of 80 mm and width of 22 mm. Hence, also known as M.2 2280.

What is Endurance?

Endurance is how long can the device survive. It is measured as the amount of data that can written before it fails. Endurance is measured in TBW.

What is TBW in SSD?

TBW is Tera Bytes Written. Tera Byte = 1,000 GB. A typical user writes around 10-20 GB per day. This includes web browsing and office work. If we calculate on maximum side, it is 20 GB * 365 days (1 year) = 7,300 GB or 7.3 TB. If a drive has 40 TBW or 3 Years warranty (whichever first), our drive will easily run 5 Years or more (40/7.3 = 5.5 Years).

But for gamers, video editors and enthusiast it would mean more writes and heavy duty. It can be around 80-100 GB per day. So, it works out TBW per year = 35 TB. So for 5 Years we require 175 TBW or more.


Get to know about best SATA SSDs here and Best NVMe SSDs here.


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