Proposed are a storage apparatus and a data input/output method capable of improving the response performance of the overall storage apparatus. When a storage controller of a storage apparatus receives a first read command that designates a plurality of storage areas in the logical volume as a read destination, the storage controller identifies the storage media and address that are actually storing the data written into the storage area, creates, for each of the storage media, a second read command that designates a part or all of each of the identified addresses in the identified storage media as a read destination and sends each of the created second read commands to the corresponding storage media, and transfers, to the host computer, the data that was read from each of the addresses designated in the second read command and sent from each of the storage media that sent the second read command.