Solid-state storage devices may be used to achieve several goals
Speed – to achieve a high rate of I/O operations, or faster data rate than magnetic disks.
Reliability – less moving parts means better reliability, especially if the system is moving or subject to vibrations.
Better form factor – for many operating systems / environments, an SSD with a small form factor (such as a Disk on Module or memory card) can suffice, allowing for smaller volume and higher reliability.
As flash is inherently unreliable media, care must be taken in choosing the right SSD for the task.