US Patent 8719621 Solid-state disk cache assisted redundant array of independent disks

A system includes a write module, a read module, and a parity module. The write module is configured to modify first user data stored on a first member of a redundant array of independent disks (RAID) using second user data. The read module is configured to read the first user data and first parity data corresponding to the first user data from a solid-state disk associated with the RAID if at least one of the first user data and the first parity data are stored on the solid-state disk, or from the RAID if the at least one of the first user data and the first parity data are not stored on the solid-state disk. The parity module is configured to generate second parity data based on the first user data, the second user data, and the first parity data.