Patent ID: 6393580
Filing Date: 2002-05-21
Classification: G06F,G11B

Abstract:
An automatic read reassignment method, comprising:an inputting step of inputting a read command issued from a host to read desired data from a magnetic disk media; a retry step of retrying a read operation when an error is generated in a previous read operation; and a step of performing one of the following three steps depending on the number of retries of the read operation when there is a relation of N1>N2>N3>0 among the natural numbers N1, N2 and N3: 1) a reporting step of reporting a read unable status to the host when the number of retries of the read operation is equal to a first threshold value N1; 2) a writing step of writing the data that is read out at a retry step to an alternation area when the number of retries of the read operation is larger than a second threshold value N2, but smaller than first threshold value N1; and 3) a writing step of writing data that is read out at a retry step to a back up area when the number of retries of the read operation is larger than a third threshold value N3, but is not larger than the second threshold value N2.