| CPC G01R 31/31724 (2013.01) [G01R 31/31705 (2013.01); G01R 31/31721 (2013.01); G01R 31/318566 (2013.01)] | 20 Claims |

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1. A storage system comprising:
a storage device comprising a data i/o port that receives power from a host of the storage system;
a diagnosis circuit that generates a test pattern, transmits the test pattern to the storage device, receives result data corresponding to the test pattern from the storage device, and tests whether the storage device normally operates by comparing the test pattern with the result data; and
a debugging port that is connected to the diagnosis circuit, receives auxiliary power from an external device external to the host, supplies the auxiliary power to the diagnosis circuit, and transmits data in the storage device to the external device.
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