Hard Disk Drives (HDDs)
Hard Disk Drives (HDDs) have been the norm in mass computer and server data storage for years. HDDs can be found in desktop computers, laptops, and mobile devices.
In 1953, the first hard disk was created by engineers at IBM. These engineers wanted a way to access a lot of data at a low price. When disk drives were first developed, their storage capacity was very low, their size was humongous, and their cost was through the roof compared to the ones we have today.
Most hard drives consist of multiple disk platters that are positioned around a spindle. The platters and spindle are usually located inside a sealed chamber along with read-and-write heads and motors. The motor spins the platters and the read-and-write heads record and read information on tracks that are on the platters.
HDDs nowadays are very affordable and come in many different storage capacities and sizes as well.
Solid State Drives (SSDs)
Solid State Drives (SSDs) are mass storage devices similar to HDDs. SSDs read and write data and can maintain data permanently without power. SSDs connect to computers the same way that HDDs would by using IDE or SATA connections.
Although SSDs have the same functionality as HDDs, they do not have any moving parts. SSDs store data using flash memory instead of on magnetic platters. This means that latency times for accessing data on SSDs is a lot shorter than on HDDs.
The one drawback of SSDs is that the cost for a lot of storage is a lot higher compared to HDD's costs.