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