Preventing Address Misrecognition
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-18
In data storage devices of the kind employing removable storage media, e.g. disk cartridges, a device which falsely recognizes address information on the medium is liable to write information in the wrong place. When the medium is transferred to a healthy machine, this fault is not apparent to the new machine, as the data appears to be error-free. Such errors could be avoided by repeating the identifier (address) of each block of stored data as part of the data. However, a more economical approach is to feed the identifier, on writing data, into the data parity generator as part of the input data stream. On reading back the data, the identifier supplied with the read command is fed into the parity generator, along with the read-back data stream.