XOR recovery schemes utilizing external memory

A method of storing parity data on volatile memory external to a storage device, the method comprising:

• receiving, via a communication interface, data from a host system for storing in non-volatile memory of the storage device;
• buffering the data in internal volatile memory of the storage device;
• obtaining parity data corresponding to the buffered data from an external volatile memory within the host system;
• computing XOR parity data for the buffered data based on the parity data and the buffered data;
• transferring the computed XOR parity data from the storage device to the host system via the communication interface;
• storing the computed XOR parity data on the external volatile memory;
• and
• writing the data from the host system to the non-volatile memory.

A storage device comprising:

• a communication means configured to connect to a host system;
• non-volatile memory means;
• volatile memory means;
• and
• processing means associated with the non-volatile memory means, the processing means configured to:
• receive data from the host system for storing in the non-volatile memory means;
• buffer the data in the volatile memory means;
• obtain parity data corresponding to the buffered data from an external volatile memory within the host system;
• compute XOR parity data for the buffered data based on the parity data and the buffered data;
• transfer the computed XOR parity data from the storage device to the host system via the communication means;
• store the computed XOR parity data on the external volatile memory;
• and
• write the data from the host system to the non-volatile memory means.