Definition - What does Transfer Rate mean?
Techopedia explains Transfer Rate
This metric is also used for technologies that deal with storing data exclusively, such as disks and disk arrays and clusters. The transfer rate for disks is dependent on the speed of the disk rotation and on the accuracy of the read/write head, whereas for solid state drives, the transfer rate depends on the efficiency of the flash technology. For storage arrays and clusters, the transfer rate takes into consideration the network connectivity between each node of the cluster, so the transfer rate serves as the throughput of the system.