Apparatus for developing a dynamic servo signal from data in a magnetic disc drive and method

A method for using information about the extent of errors comprising the steps of

• positioning a first transducer for sensing predetermined storage locations having stored data containing at least one constraint and generating a first signal representative of the data containing at least one constraint from said predetermined storage locations and any errors introduced into the sensed data during said sensing;
• generating in response to said first signal a control signal containing information about the extent of errors in said sensed data and extracting a data signal;
• and
• receiving said control signal and performing in response thereto a control function to improve the extracted data signal as a function of the extent of errors.

A method for adjusting the position of a transducer having at least one read element and write element relative to a track containing data being sensed by the read element comprising the steps of

• positioning the read element for sensing said track and generating a first signal representative of stored data containing at least one constraint from said predetermined storage locations and any errors introduced into the sensed data during said sensing;
• generating with an input device in response to said first signal a control signal containing information about the extent of errors in said sensed data and extracting a data signal;
• and
• receiving with an output device said control signal and performing in response thereto a control function of adjusting said transducer with an adjusting element in response to information about the extent of errors in said control signal in a direction to position said at least one read element to improve alignment of read element relative to said track.

A method for using information about the extent of errors in a storage system comprising the steps of

• positioning a transducer for sensing data from predetermined storage locations in a storage system having stored data containing at least one constraint;
• producing from said transducer a first signal representative of the sensed data containing said at least one constraint from said predetermined storage locations and any information about errors introduced into the sensed data during sensing in said storage system;
• generating with an input device responsive to said first signal a control signal containing information about the extent of errors in said sensed data;
• extracting from said first signal a data signal;
• and
• receiving with an output device said control signal for performing a control function in response thereto to improve the extracted data stored in said predetermined storage locations in a storage system as a function of the extent of errors in the sensed data.

A storage system comprising

• a storage medium having located thereon predetermined storage locations having stored data containing at least one constraint;
• a transducer positioned relative to said storage medium for sensing the data containing said at least one constraint stored in said predetermined storage locations and generating a first signal representative of said sensed data containing said at least one constraint and any errors introduced into the sensed data during said sensing;
• an input device responsive to said first signal for generating a control signal containing information about the extent of errors in the sensed data and for extracting a data signal;
• and
• an output device operatively coupled to said input device for receiving said control signal and for performing a control function in response thereto to improve the extracted data signal as a function of the extent of errors in the sensed data stored as data in said predetermined storage locations in said storage media.

A detection apparatus comprising

• a first transducer being movably positioned for sensing stored data containing at least one constraint, said first transducer generating a first signal representative of sensed data containing at least one constraint stored as stored data and any errors introduced into the sensed data during said sensing;
• a detector responsive to said first signal for producing a control signal containing information about the extent of errors in said sensed data and extracting a data signal;
• and
• an output device operatively coupled to the detector for receiving said control signal and for performing a control function in response thereto to improve the extracted data from said stored data as a function of the extent of errors in the sensed data.

A method for using information about the extent of errors in combination with servo burst signals generated from prerecorded servo bursts comprising the steps of

• positioning a first transducer for sensing prerecorded servo bursts and predetermined storage locations having stored data containing at least one constraint and generating in response to said prerecorded servo bursts servo burst signals and in response to the stored data a first signal representative of the data containing at least one constraint from said predetermined storage locations and any errors introduced into the sensed data during said sensing;
• producing in response to the servo burst signals a position error signal;
• generating in response to said first signal a control signal containing information about the extent of errors in said sensed data and extracting a data signal;
• and
• receiving said position error signals and said control signal and adjusting with an adjusting element in the intervals between the servo burst signals the transducer in response to the position error signals to position the transducer in a designated alignment relative to said predetermined storage locations and performing in the intervals between the servo burst signals and in response to the control signal containing information about the extent of errors a control function to improve the extracted data signal as a function of the extent of errors.

Apparatus comprising

• a first transducer for sensing stored data containing at least one constraint and prerecorded first servo burst data from a track on a first surface of a disc and producing from said first transducer a first signal representative of the stored data containing at least one constraint and any errors introduced into the sensed data during said sensing and first servo burst signals;
• a second transducer for sensing stored data containing at least one constraint and prerecorded second servo burst data from a track on a second surface of a disc wherein an integrated relationship exists between the first surface and the second surface and producing from said second transducer a second signal representative of the stored data containing at least one constraint and any errors introduced into the sensed data during said sensing and second servo burst signals;
• an input device responsive to said first signal and said second signal for generating in response to said first signal a first control signal containing information about the extent of errors in said sensed data and extracting a first data signal and generating in response to said second signal a second control signal containing information about the extent of errors in said sensed data and extracting a second data signal, said input device generating a first position error signal from said first servo burst signals and a second position error signal from said second servo burst signals;
• and
• an output device responsive to said first servo burst signals and said second servo burst signals for adjusting with an adjusting element in a closed servo loop the first transducer and second transducer in response to the position error signals and responsive to said first control signal and said second control signal for adjusting with said adjusting element during the intervals between each of said first servo burst signals and said second servo burst signals the first and second transducers in response to the information concerning the extent of errors in said first control signal and said second control signal.