| 摘要 |
<p>A method of writing information in a storage layer ( 2 A, 2 B) of a multi-layer optical storage medium ( 2 ) comprising two or more storage layers ( 2 A, 2 B), especially multi-layer recordable and rewritable optical discs, especially DVD discs or BD discs. The method comprises the steps of monitoring a focus condition of an optical write beam ( 32 b), and inhibiting the writing process in case of an axial focus displacement event. Also described is a medium access device ( 10 ), capable of writing information in a storage layer ( 2 A, 2 B) of a multi-layer optical storage medium ( 2 ). The medium access device ( 10 ) comprises: light beam generating means ( 31 ) for generating a write light beam ( 32 ); focussing means ( 34 ) for focussing the write ( 32 ) in a focal spot (F) at a target storage layer ( 2 A); write inhibit means ( 64 ) for inhibiting a writing process in case of an axial focus displacement event.</p> |
