How do solid-state drives differ from hard disk drives?

Solid-state drives (SSDs) and hard disk drives (HDDs) differ primarily in their underlying technology and mechanical construction.

Hard Disk Drives (HDDs)
HDDs are magnetic storage devices that rely on physical motion to function. They consist of several rigid, circular platters coated with magnetic material that spin at high speeds—up to 15,000 revolutions per minute. Data is written and read by electromagnetic heads that move radially across the spinning surfaces to magnetize or detect tiny spots of data. Because they contain moving parts like motors and mechanical arms, they are susceptible to physical wear and require a sealed environment to protect the disks from dust.123

Solid-State Drives (SSDs)
In contrast, SSDs utilize flash memory chips to store information. The most significant difference is that SSDs have no moving parts. This design provides several advantages:32
* Durability: Without mechanical components, they are more resistant to physical damage.2
* Acoustics: They operate more quietly than HDDs.2
* Efficiency: They offer memory in a smaller, more compact package.2

While HDDs have historically been the standard for high-capacity storage, SSDs have become increasingly popular for their performance and reliability benefits.32