Address mapping method and operation method of storage device

An operation method of a storage device which includes a plurality of sub-storage devices, each of the sub-storage devices including over-provision area respectively, the method comprising:

• detecting whether to redistribute an available capacity of the overprovision area in at least one of the plurality of sub-storage devices;
• notifying a host of a logical address mapped onto a fail area of a first memory area as a defective logical address and a reallocated logical address onto a second memory area for replacing the first memory area mapped onto the defective logical address as the reallocated logical address based on the determining;
• and
• writing data of the first memory area rebuilt by the host in overprovision area of the second memory area and distributing and storing data present in the second memory area to and in the over-provision areas of the plurality of sub-storage devices.

An operation method of a storage device which includes a plurality of sub-storage devices respectively including over-provision areas, the method comprising:

• detecting whether a fail memory area is present in at least one of the plurality of sub-storage devices;
• notifying a host of a first logical address corresponding to the fail memory area and a second logical address corresponding to a reallocated logical address for replacing the fail memory area as a defective logical address respectively, depending on the detection result;
• and
• storing data of a rebuilt fail memory area and a rebuilt reallocated memory area in the plurality of sub-storage devices,
• wherein a part of the data of the rebuilt fail memory area and the rebuilt reallocated memory area are distributed to and stored in the over-provision areas of the plurality of sub-storage devices.