Abstract: A prefetch controller controls retrieval of data from a data storage device in response to a current host command received from a host device. The prefetch controller includes a sequential read detector configured to generate a new sequential read indication for the current host command if the current host command and a previously received host command specify read operations that are non-sequential. The prefetch controller includes a transfer length generator configured to provide a first transfer length value to the data storage device if the new sequential read indication is generated for the current host command, and provide a second transfer length value to the data storage device if the new sequential read indication is not generated for the current host command.