Method and apparatus for transferring data and making on-the-fly correction of errors

Abstract

A method and apparatus for transferring data in a disc apparatus are disclosed which perform on-the-fly correction. The disc apparatus includes a disc drive for transferring read data to a disc controller after a head has read the data from a storage disc. This disc controller transfers the data from the disc drive to a host device. The data transferring method reads data recorded on the storage disc in a CKD format in which one block is composed of a plurality of subblocks each having an error correction code. Errors in the data are detected by use of an error detection code on a subblock-unit; and after correcting the data of the error-detected subblock, the corrected data on the subblock-unit are transferred with the data of at least the previous subblock, at a speed higher than a reading speed. The data transferring apparatus includes a read circuit for reading data recorded in a CKD format on the storage disc, in which one block is composed of a plurality of subblocks each having an error correction code. An error detection circuit detects an error in the read data by use of the error detection code on the subblock-unit; and a transfer circuit corrects the data of the error-detected subblock, and transfers the corrected data on the subblock-unit and, at the same time, transfers the data of at least the subblock positioned previous to the disc controller at the speed higher than the reading speed.

Dependencies are inferred from the claim text.