Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2011-03-29
2011-03-29
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07916421
ABSTRACT:
Methods and structures for recovering from an off-track position error in a dynamically mapped storage device. In a dynamically mapped storage device data is dynamically mapped to a physical location on the recordable media. Thus, when a write fault occurs, such as an off-track position error, the data may be re-written and re-mapped at a different location on the recordable media. In a dynamically mapped storage device data may be reordered into a sequential stream of contiguous physical data blocks. Random host data blocks may be mapped into sequential physical data blocks on the recordable media. Further, the sequential reordering of the data blocks may ensure that no data is present in tracks or sectors directly ahead of the track of sector being written. Further, the system has the ability to store multiple revolutions of host supplied data within the disk drive memory buffer and maintain the information in memory while writing it to the recordable media. The multiple revolutions of host supplied data may be used to recover from the destruction of previously written physical blocks overwritten during an off-track position error.
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Liikanen Bruce A.
Vogan Andrew W.
Lucente David K.
Seagate Technology LLC
Tzeng Fred
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