Optical Disk ECC Threshold Control
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
The adapter of an optical disk drive can be controlled from the host computer to change the threshold of errors past which the adapter's error correcting code (ECC) logic will indicate a permanent disk error and not attempt to correct the data field or its ID field. The adapter is shown in the figure. Elements of the adapter are the channel interface and control 10, the sector buffer 12, ECC check and syndrome generation 14, and data separator 16. Micro- controller 18 supervises the adapter. It interprets commands from the host and controls ECC logic 14, channel interface 10 and the drive interface 20. Micro-controller 18 also sends error and status messages to the host. Drive/receive logic 19 is used to adapt the channel interface to different host computers.