Method of managing defect and apparatuses using the same

1. A method comprising:

setting a defect reference value in response to (1) a number of error correction code (ECC) symbols calculated in a sector and (2) a size of a replacement region.

2. The method of claim 1 , wherein the setting the defect reference value comprises:

storing a log of the number of calculated ECC symbols of a sector in a memory or a magnetic storage medium.

3. The method of claim 1 , further comprising;

identifying a sector as a defect sector when the sector has a number of ECC symbols greater than a set defect reference value.

4. A controller that sets a defect reference value in response to (1) a calculated number of error code correction (ECC) symbols in a sector and (2) a size of a replacement region.

5. The controller of claim 4 , wherein the controller sets the defect reference value adaptively to determine a corresponding sector as a defect sector.

6. The controller of claim 4 , wherein the controller stores the number of calculated ECC symbols of a sector in a memory or a magnetic storage medium and sets the defect reference value adaptively to identify a corresponding sector as a defect sector.

7. A computer system comprising:

a hard disk drive; and

a processor to control an operation of the hard disk drive, wherein the hard disk drive comprises:

a magnetic storage medium;

a head; and

a hard disk controller to calculate a number of ECC symbols of every sector to becomes an object of a defect scan based on a signal output from the head and to set a defect reference value based on a result of the calculation and a size of a replacement region.

8. The computer system of claim 7 , wherein the hard disk controller sets a sector having the number of ECC symbols greater than a set defect reference value as a defect sector.