A recording medium on which a recording/reproducing unit block is recorded, an apparatus to record and/or reproduce data on/from the recording medium, and a method of recording/reproducing the data on/from the recording medium. The recording/reproducing unit block comprises invalid data used in disc certification, and an identifier to indicate that the invalid data is included in the recording/reproducing unit block, the invalid data being used during the disc certification on a portion of the recording medium or the entire recording medium.

 
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< Head stack assembly including a flexure with radially inward fingers projecting into a flexure tail hole, and method of coupling the flexure to a flex cable

> Trailing shield design for reducing wide area track erasure (water) in a perpendicular recording system

> Adjustment system using ball-ended guide rods to align tape drive heads
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