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A solid-state drive (SSD) also known as Solid State Disk have become the most preferred storage drive today. Although SSDs are still not cheap, they have come down in price, making them a better alternative to hard drives. SSDs today are far more reliable, have greater endurance and perform better (in some cases, two to three times better). Most of the advantages of solid-state drives over traditional hard drives are due to their ability to access data completely electronically instead of electromechanically, resulting in superior transfer speeds and mechanical ruggedness. Field failure rates indicate SSDs are significantly more reliable than HDDs. The startup time required by SSD’s are almost instantaneous whereas disk spin-up may take several seconds on HDD .
SSDs do not usually require any special cooling and can tolerate higher temperatures than HDDs. According to Seagate, ambient temperatures above 95 °F (35 °C) can shorten the life of a hard disk, and reliability will be compromised at drive temperatures above 131 °F (55 °C). Fan cooling may be required if temperatures would otherwise exceed these values. Solid state drives, essentially semiconductor memory devices mounted on a circuit board, are small and light in weight. HDDs typically have the same form factor but may be heavier. This applies for 3.5-inch drives, which typically weigh around 700 grams.
Less expensive SSDs typically have write speeds significantly lower than their read speeds. Higher performing SSDs have similar read and write speeds. Whereas HDDs generally have slightly lower write speeds than their read speeds.
There are two types of SSD’s internal & external SSD drive. Internal SSD drives are used to achieve shorter boot-up times whereas external SSd drives can make backups easier and faster. The external SSD’s are more expensive in comparison but are used more and more in professional environments to avoid exposing sensitive data via the internet or cloud. There is another set of drives which is also used today called Hybrid drives or solid state hybrid drives (SSHD). It is a combination of the features of SSDs and HDDs in the same unit, containing a large hard disk drive and an SSD cache to improve performance of frequently accessed data