Data storage system, data storage device and raid controller

A data storage device comprising:

• m memory chips, where m is a natural number greater than one;
• a plurality of memory controllers configured to program data to the first to mth memory chips;
• and
• a controller configured to receive a RAID configuration signal, including a RAID operation signal for determining whether to activate or deactivate a RAID operation, and data from a host and to transmit the same to at least one of the memory controllers, wherein the controller is further configured to control RAID operations of the plurality of memory controllers using the RAID configuration signal, each of the memory controllers being configured to generate a RAID parity using first to (m−1)th data from the controller and program the first to (m−1)th data to the first to (m−1)th memory chips and the RAID parity to the mth memory chip when the RAID operation signal is activated, and
• wherein the controller is further configured to program the first to mth data received from the controller to the first to mth memories when the RAID operation signal is deactivated.

A semiconductor device comprising:

• a nonvolatile memory comprising m memory chips, where m is a natural number greater than one;
• a memory controller configured to control access operations of the m memory chips;
• a RAID controller configured to turn ON and OFF a RAID operation of the memory controller by transmitting a RAID operation signal to the memory controller,
• wherein the memory controller is further configured to write a data unit to each of m−1 of the memory chips and a parity value calculated from the data unit to an mth memory chip when the RAID operation of the memory controller is ON, and
• wherein the memory controller is further configured to write the data unit to each of the m memory chips when the RAID operation of the memory controller is OFF.