OPERATION METHOD OF STORAGE DEVICE

An operation method of a storage device connected to a host may include fetching one or more first commands from a first submission queue of the host by performing a first command fetch operation, processing one or more remaining commands other than the last command of the one or more first commands when a last command among the one or more first is a first fused commands, fetching one or more second commands from a second submission queue of the host by performing a second command fetch operation, processing the one or more second commands, and fetching at least two third commands from the first submission queue of the host by performing a third command fetch operation. The at least two third commands may include the first fused command and a second fused command corresponding to the first fused command.