Patent ID: 6693755
Filing Date: 2004-02-17
Classification: G11B

Abstract:
A data reader arranged to read data comprising user data and non-user data written across at least two channels of a data-holding medium, said data being arranged into a plurality of data items each containing user data and non-user data, with said non-user data holding information relating to said user data, including a header with information relating to said user data and header error detection information, and data items written across the said channels at the same time being identified as a set of data items, said data reader having a read head for reading a respective said channel of said data-holding medium to generate a data signal comprising said data items, and processing circuitry arranged to receive and process said data signals of a set of data items, including processing said header error detection information of each of said headers of said data items in said set to detect any of said headers which are in error, and further processing said headers to obtain information from a correct said header to correct a said header which is in error.