HDD
A computer hard disk drive (HDD) is a non-volatile memory hardware device that controls the positioning, reading and writing of the hard disk, which furnishes data storage. [Source: TechTarget]
High Throughput Computing
Compute tasks that are easily broken into parallel non-communicating jobs to be disseminated across multiple virtual machines.
Hot Storage
High durability, availability, and performance object storage for frequently accessed data [Source: AWS]