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Reference Mark Positioning Information By Microcode Disclosure Number: IPCOM000066354D
Original Publication Date: 1979-Feb-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue


Related People

Dodt, WC Rehage, TA [+details]


A reference mark is generated by a tape drive device to establish the accurate positioning of the tape so additional read or write operations can be performed. This reference mark is placed at a fixed distance from the ending sync signal of all data records. The generation of the reference mark formerly was handled by hardware. However, if a media fault occurred such that an interblock gap was detected, the reference mark would be generated. The read operation would stop even though the error correction code could handle this fault. Further, depending upon where the fault occurred, a record that generated the fault could be read again while the system assumed that it was the succeeding record.