A solid-state drive is a new type of storage device that has replaced the old hard disk drives (HDDs) in many laptops and desktop computers. Its main advantage is that it has no moving parts and thus works faster. It is also more resistant to physical shock and runs quieter. However, it is usually more expensive per gigabyte than HDDs.
An SSD store data in semiconductor blocks called NAND. Each block contains an array of transistors, with a bit that can be set to either a 0 or a 1. The bits are stored in the gates, and the NAND chips are stacked together to achieve different densities. An SSD controller reads and writes data to and from these NAND memory chips.
When a computer requests a specific piece of data, the SSD controller erases the current contents of the relevant memory block and writes new data to it. It does this for all the blocks on the drive, even the ones that have already reached their maximum lifetime number of writes. This process is called wear leveling.
Because they have no moving parts, SSDs are more reliable than HDDs. This makes them better able to handle drops, shakes and vibrations that can cause the electromechanical components in an HDD to break down over time. They also generate much less heat, allowing them to run silently and keep their performance up over longer periods of time. They are also better able to resist the internal corrosion that can occur from constant use. SSD drive