US5062011A — Address mark generating method and its circuit in…

Claim 1

Independent Claim 104 words

A data recording method using a 2-7 RLL (Run Length Limited) code as a recording sign on a recording medium comprising the steps of: detecting 1-byte of data comprising a hexadecimal notation "8B" arranged in a NRZ (Non-Return to Zero) signal to be input; converting said 1-byte of data "8B" into a 2-17 RLL code; modifying said 2-7 RLL code, corresponding to said 1-byte of data "8B", into a 2-7 illegal pattern, wherein said 2-7 illegal pattern satisfies rules of said 2-7 RLL code but which does not normally exist; and recording said 2-7 illegal pattern on the recording medium as an address mark.

Claim 2

Dependent Claim 104 words

A data recording method using a 2-7 RLL (Run Length Limited) code as a recording sign on a recording medium comprising the steps of: detecting 1-byte of data comprising a hexadecimal notation "8B" arranged in a NRZ (Non-Return to Zero) signal to be input; converting said 1-byte of data "8B" into a 2-17 RLL code; modifying said 2-7 RLL code, corresponding to said 1-byte of data "8B", into a 2-7 illegal pattern, wherein said 2-7 illegal pattern satisfies rules of said 2-7 RLL code but which does not normally exist; and recording said 2-7 illegal pattern on the recording medium as an address mark.

Claim 3

Dependent Claim 46 words

The data recording method according to claim 1, wherein: said modifying step further includes, eliminating a futile bit from said 2-7 RLL code, where said 2-7 code corresponds to said 1-byte of data "8B", the 2-7 RLL code thereby being modified into said 2-7 illegal pattern.

Claim 4

Dependent Claim 35 words

The data recording method according to claim 1, further including: an inserting step wherein said 1-byte of data "8B" is inserted into a specific position of said NRZ signal before said NRZ signal is input.

Claim 5

Dependent Claim 169 words

An address mark generating device of a data memory which, with the use of a 2-7 RLL (Run Length Limited) code, records and plays back data on a disc type recording medium of a sector format the device comprising: a means for detecting 1-byte of data comprising a hexadecimal notation "8B" located in a NRZ (Non-Return to Zero) signal to be input; a means responsive to said detecting means for converting the 1-byte of data "8B" in said NR signal into a 2-7 RLL code; a means for modifying said 2-7 RLL code, where said 2-7 RLL code corresponds to the 1-byte of data "8B" in said NRZ signal converted by said converting means according to the output of said detecting means, into a 2-7 illegal pattern, wherein said 2-7 illegal pattern satisfies rules of said 2-7 RLL code but which does not normally exist; and a means responsive to said modifying means for recording said 2-7 illegal pattern on the disc type recording medium as an address mark.

Claim 6

Dependent Claim 169 words

An address mark generating device of a data memory which, with the use of a 2-7 RLL (Run Length Limited) code, records and plays back data on a disc type recording medium of a sector format the device comprising: a means for detecting 1-byte of data comprising a hexadecimal notation "8B" located in a NRZ (Non-Return to Zero) signal to be input; a means responsive to said detecting means for converting the 1-byte of data "8B" in said NR signal into a 2-7 RLL code; a means for modifying said 2-7 RLL code, where said 2-7 RLL code corresponds to the 1-byte of data "8B" in said NRZ signal converted by said converting means according to the output of said detecting means, into a 2-7 illegal pattern, wherein said 2-7 illegal pattern satisfies rules of said 2-7 RLL code but which does not normally exist; and a means responsive to said modifying means for recording said 2-7 illegal pattern on the disc type recording medium as an address mark.

Claim 7

Dependent Claim 35 words

The address mark generating device according to claim 4, wherein: said modifying means forms said 2-7 illegal pattern by reversing a 7th bit of said 2-7 RLL code corresponding to said 1-byte of data "8B".

Claim 8

Dependent Claim 46 words

The address mark generating device according to claim 5 further comprising: an inserting means for inserting said 1-byte of data "8B" into a position of an address mark in said RNZ signal, where said inserting means is connected to a former stage of said detecting means.

Claim 9

Dependent Claim 166 words

A magnetic disc device wherein the data of 2-7 RLL (Run Length Limited) code are recorded in an played back from each track on a magnetic disc in sector format the device comprising: a sending means for sending out a NRZ (Non-Return to Zero) signal by inserting 1-byte of data comprising a hexadecimal notation "8B" in a part where an address mark of each sector of said magnetic disc is to be positioned; a converting means for converting said NRZ signal into a 2-7 RLL code; a detecting means for detecting said 1-byte of data "8B" from said NRZ signal, said detecting means being part of said converting means; a modifying means for modifying said 2-7 RLL code, corresponding to said 1-byte of data "8B" converted with said converting means according to an output of said detecting means, into a 2-7 illegal pattern; and a recording means for recording said 2-7 RLL code having said 2-7 illegal pattern in a specified position on said magnetic disc.

Claim 10

Dependent Claim 166 words

A magnetic disc device wherein the data of 2-7 RLL (Run Length Limited) code are recorded in an played back from each track on a magnetic disc in sector format the device comprising: a sending means for sending out a NRZ (Non-Return to Zero) signal by inserting 1-byte of data comprising a hexadecimal notation "8B" in a part where an address mark of each sector of said magnetic disc is to be positioned; a converting means for converting said NRZ signal into a 2-7 RLL code; a detecting means for detecting said 1-byte of data "8B" from said NRZ signal, said detecting means being part of said converting means; a modifying means for modifying said 2-7 RLL code, corresponding to said 1-byte of data "8B" converted with said converting means according to an output of said detecting means, into a 2-7 illegal pattern; and a recording means for recording said 2-7 RLL code having said 2-7 illegal pattern in a specified position on said magnetic disc.

Claim 11

Dependent Claim 51 words

The magnetic disc device according to claim 7, further comprising: a playback means to playback said 2-7 RLL code from said magnetic disc; and a generating means to generate an address mark detection signal, by detecting said 2-7 illegal pattern from said 2-7 RLl code played back with said playback means.

Claim 12

Dependent Claim 34 words

The magnetic disc device according to claim 7, wherein: said modifyign means forms said 2-7 illegal pattern by eliminating said futile bit from said 2-7 RLL code corresponding to said 1-byte of data "8B".

Claim 13

Dependent Claim 34 words

The magnetic disc device according to claim 7, wherein: said modifying means forms said 2-7 illegal pattern by reversing a 7th bit of said 2-7 RLl code corresponding to said 1-byte of data "8B".

Claim 14

Independent Claim 118 words

An apparatus adapted for generating and detecting address marks in an associated magnetic disc system, said apparatus comprising: an encoding shift register for temporarily storing an incoming signal adapted to be input into the associated magnetic disc system; an encoder responsive to said encoding shift register for converting the incoming signal into a desired code; a byte pattern detector for detecting a predetermined byte pattern comprising a hexadecimal notation "8B", delivered from said encoding shift register, and for outputting a detected byte pattern signal; and an illegal pattern generating controller responsive to said byte pattern detector for generating a control signal for forming an illegal pattern, after said illegal pattern generating controller receives the detected byte pattern signal.

Claim 15

Independent Claim 118 words

An apparatus adapted for generating and detecting address marks in an associated magnetic disc system, said apparatus comprising: an encoding shift register for temporarily storing an incoming signal adapted to be input into the associated magnetic disc system; an encoder responsive to said encoding shift register for converting the incoming signal into a desired code; a byte pattern detector for detecting a predetermined byte pattern comprising a hexadecimal notation "8B", delivered from said encoding shift register, and for outputting a detected byte pattern signal; and an illegal pattern generating controller responsive to said byte pattern detector for generating a control signal for forming an illegal pattern, after said illegal pattern generating controller receives the detected byte pattern signal.

Claim 16

Dependent Claim 34 words

The apparatus for generating and detecting address marks in the associated magnetic disc system according to claim 11, wherein said address marks designate track and sector positions of the associated magnetic disc system memory.

Claim 17

Dependent Claim 103 words

The apparatus for generating and detecting address marks in the associated magnetic disc system according to claim 11, further including an address mark detection means wherein said address mark detection means includes: a decoding shift register for temporarily storing data previously encoded; an illegal pattern detector for detecting an illegal pattern from the data decoded by said decoding shift register; an address mark detector signal circuit for generating an address mark detector signal in response to reception of the illegal pattern detector's output; a decoder for decoding the encoded data into a form similar to which it was upon entry into the system.

Claim 18

Dependent Claim 35 words

The apparatus for generating and detecting address marks in the associated magnetic disc system according to claim 11, wherein forming of the illegal pattern includes at least one of eliminating and reversing a futile bit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-10-28	1995-04-29	1995-10-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-10-28	1999-04-29	1999-10-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-10-28	2003-04-29	2003-10-29	$7700.00	Window Closed / Lapsed

Address mark generating method and its circuit in a data memory

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