Latency refers to the amount of time it takes before the drive can begin reading and writing. Compared to hard disk drives, solid state drives have lower latency since data can be accessed directly from any location. Solid state drives do not need to wait for disks to spin up and for the read/write head to position itself appropriately.
* Device measured using Iometer workload based on sequential 4 KB at queue depth 1. 4 KBs equals 4,096 bytes.