公开(公告)号：EP0108225A3

公开(公告)日：1985-01-16

申请号：EP83109322

申请日：1983-09-20

Applicant: International Business Machines Corporation

Inventor： Dix, Gary Lee ,  Heim, Lloyd Stephen ,  Herald, Robert Frederick ,  Quinlan, William Patrick

IPC: G06F11/00 ,  G11B05/09 ,  G11B19/04

CPC classification number: G06F11/0772 ,  G06F11/0727 ,  G11B20/18

Abstract: Error information is passed across a limited interface (10) from a disk drive to its using system by making use of the read data line during a fault mode operation. Fault mode operation is detected by a pulse width detector (46) in an adapter between the using system and the disk drive. The pulse width detector detects the presence of a fault signal on the read data line and inhibits the passage of the spindle motor on (MTR ON) signal from the using system to the disk drive. The step signal (STEP) normally used to index the recording head is passed to the disk drive during fault mode operation. A microcomputer (30) at the disk drive detects the absence of the MTR ON signal and the presence of the step signal and outputs a fault data bit. Thereafter, the fault data word is gated onto the read data line at the rate of one bit per step so long as the MTR ON signal is absent.

公开(公告)号：EP0074656A3

公开(公告)日：1984-07-04

申请号：EP82108437

申请日：1982-09-13

Applicant: SONY CORPORATION

Inventor： Ogawa, Hiroshi ,  Yamagami, Tamotsu

IPC: G11B05/09 ,  G11B07/00 ,  H04L25/49

CPC classification number: G11B20/1426 ,  G11B7/013 ,  G11B20/10 ,  H04L25/4908

Abstract: A system for encoding a binary digital information signal comprised of 8-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of 17-bit channel words formed of 14-bit information words and 3-bit separation words and with the encoded signal satisfying the d- and k-constraint rules, reducing DC imbalance and having substantially reduced components thereof in a predetermined undesirable lower frequency range of the frequency band, the system converting each 8-bit information word into a 14-bit information word; generating a set of four possible 3-bit separation words for use with each 14-bit information word which satisfy the d and k-constraint rules; determining an integrating transfer function characteristic having a high gain with respect to the predetermined frequency range; obtaining a step response by modifying each 14-bit information word and each respective possible 3-bit separation word by the integrating transfer function characteristic; evaluating the step response for a predetermined number of 14-bit information words and respective possible 3-bit separation words, either separately for each word or at the end of each possible 17-bit channel word, to obtain values including information with respect to the predetermined frequency range; selecting the possible 3-bit separation word for each 14-bit information corresponding to a respective one of the values which is closest to zero; and adding each selected 3-bit separation word to each respective 14-bit information word to produce a plurality of 17-bit channel words which form the encoded binary digital information signal.

公开(公告)号：EP0058253A3

公开(公告)日：1983-02-16

申请号：EP81110576

申请日：1981-12-18

Applicant: International Business Machines Corporation

Inventor： Buhler, Otto Richard ,  Gardner, Homer Jay ,  Marino, Peter Thomas

IPC: G11B05/09 ,  G11B05/45 ,  H03G03/20

CPC classification number: G11B20/1426 ,  G11B5/035

Abstract: A system for reading information stored in a flexible magnetic disk is disclosed. The system involves an amplitude detector 10 for detecting at predetermined times whether the amplitude of the read signal is positive, zero or negative. This system includes an amplifier 16 for the differential raw data signal whose gain is variable in response to changes in the amplitude of the raw data signal which occur over a relatively long period. The output of the automatic gain control amplifier 16 is an equalized differential signal applied to the detector 10 and to a threshold generator 18 which provides an output reference signal which is a predetermined percentage of the input signal, and which is capable of following relatively rapid changes in the amplitude of the input signal. A positive detector channel 11 and a negative detector circuit 12 each comprise a comparator circuit 50, 51 and continually compares the differential equalized data signal against the generated threshold reference signal. The outputs of these comparators 50, 51 are set in latches 70, 71 and are sampled at clock times established from a phase-locked loop 14. The loop 14 is synchronized by pulses derived from the peaks of the input data signal by the clocking channel 14. The channels 11, 12, 13 respectively comprise filters 65, 64, 63 having similar delay times.

公开(公告)号：EP0058081A3

公开(公告)日：1983-02-09

申请号：EP82300624

申请日：1982-02-09

Applicant: SONY CORPORATION

Inventor： Odaka, Kentaro

IPC: G11B05/09

CPC classification number: G11B20/1803 ,  G11B20/1426

Abstract: The invention provides methods and apparatus for encoding binary data (a) by which an improved sequence of encoded binary digits (d) suitable for NRZI modulation to produce a recording signal (e) is obtained. The sequence of encoded binary digits (d) obtained consists of a plurality of binary digit blocks (Bn), each of which is formed with a predetermined number (n) of the encoded binary digits (b) obtained from the binary data (a) and redundant codes (J), each of which is inserted between each successive two of the binary digit blocks (Bn), and can produce the recording signal (e) forming a rectangular pulse train with a waveform which has a long minimum run length and does not contain a DC component or contains a reduced DC component when it is NRZI modulated.

公开(公告)号：EP0034055A3

公开(公告)日：1981-11-25

申请号：EP81300507

申请日：1981-02-06

Applicant: SPERRY CORPORATION

Inventor： Fung, Anthony Kwok

IPC: G11B05/09 ,  H04L25/49

CPC classification number: G11B20/1423 ,  G11B20/1419

Abstract: In a data recovery system, encoded variable bit-spaced digital data are recovered by providing variable width windows which are widened or narrowed to tend to centre on the expected occurrence of data signals as a function of the contents of the current or the immediately preceding timing units and of characteristics of the encoding scheme. The system employs pulse by pulse synchronization without modifying the underlying overall synchronization. The first occurrence of a shifted, e.g. delayed, signal serves as reference point for the window size for subsequent signals. The window for a reference pulse is expanded at its trailing edge if, for example, the reference pulse is delayed beyond the normal tolerance of the detection system. The leading edge of a window for the subsequent signal is initially advanced, and, if no signal occurs within that window, its trailing edge is advanced too. A circuit (10) employs a Read Only Memory (18) and recycling window (20) and signal position (16) counters to modify recovery windows according to the invention. The encoding technique is particularly applicable to data storage and retrieval systems employing encoding schemes such as Modified Frequency Modulation (MFM) coding and the like.

公开(公告)号：WO1998049675A1

公开(公告)日：1998-11-05

申请号：PCT/US1997007303

申请日：1997-04-29

Applicant: TERASTOR CORPORATION

Inventor： TERASTOR CORPORATION ,  KNIGHT, Gordon, R. ,  AL-SAMARRIE, John ,  BLANKENBECKLER, David ,  BONN, Brian ,  BURROUGHS, Alan ,  DALZIEL, Warren ,  HAJJAR, Roger ,  JAIN, Amit ,  MA, Guolin ,  TREMAINE, Brian

IPC: G11B05/09

CPC classification number: B82Y10/00 ,  G11B7/00745 ,  G11B7/08564 ,  G11B7/122 ,  G11B7/1374 ,  G11B7/1387 ,  G11B7/14 ,  G11B11/10515 ,  G11B11/10554 ,  G11B11/10569 ,  G11B11/1058 ,  G11B11/10584 ,  G11B20/1258 ,  G11B23/0328 ,  G11B2007/0013 ,  G11B2007/13727

Abstract: An electro-optical storage system based on air-bearing-suspended optical head in a near-field configuration. The system comprises a read/write head and a head positioning system, an optics module (1702) including beam relay optics and signal detectors (1804), an optical medium (1714) and a corresponding medium driving unit, and an electronic control system. The optical head includes a near-field lens with a high index of refraction and in a near-field regime has a numerical aperture greater than unity when the spacing between an exit facet of the optical head and a recording layer in an optical medium is a fraction of the wavelength.

Abstract translation: 一种基于近场配置的空气悬挂光头的电光存储系统。 该系统包括读/写头和头定位系统，包括光束中继光学器件和信号检测器（1804）的光学模块（1702），光学介质（1714）和相应的介质驱动单元以及电子控制系统。 光头包括具有高折射率的近场透镜，并且在近场状态下，当光学头的出射面与光学介质中的记录层之间的间隔为 波长的分数。

公开(公告)号：WO1998003970A1

公开(公告)日：1998-01-29

申请号：PCT/US1997012503

申请日：1997-07-18

Applicant: QUANTUM CORPORATION

Inventor： QUANTUM CORPORATION ,  ROBERTSON, Bryan ,  HOSPODOR, Andrew, D.

IPC: G11B05/09

CPC classification number: G11B20/1883 ,  G11B19/04 ,  G11B27/36 ,  G11B2020/1234 ,  G11B2220/20

Abstract: In a hard disk drive (100) including a disk spindle (102) and a rotary actuator assembly (104), a method for compensating for a defective sector in a track (107-110) is provided. During a read operation whereby data is retrieved in a steady stream (e.g., an audio/video drive), a quick check is made each time a sector is accessed to determine whether the data is correct. If a sector is deemed to be defective, the disk drive sets an allocation flag and records it in a diagnostic memory (111). The disk drive continues with its read operation in this manner until all requested data has been retrieved. Thereupon, the disk drive goes back and performs a reallocation procedure to correct for any defective sectors as indicated by the allocation flags retained in the diagnostic memory. The described method preserves the sequential nature of data on the disk (101), and provides assurance that the reallocation process continues without data loss, even during power sequencing.

Abstract translation: 在包括盘主轴（102）和旋转致动器组件（104）的硬盘驱动器（100）中，提供了用于补偿轨道（107-110）中的缺陷扇区的方法。 在读取操作期间，以稳定流（例如，音频/视频驱动器）检索数据，每次访问扇区时进行快速检查，以确定数据是否正确。 如果扇区被认为有缺陷，则磁盘驱动器设置分配标志并将其记录在诊断存储器（111）中。 磁盘驱动器以这种方式继续读取操作，直到检索到所有请求的数据。 于是，磁盘驱动器返回并执行重新分配过程以校正由保留在诊断存储器中的分配标志所指示的任何缺陷扇区。 所描述的方法保留了磁盘（101）上的数据的顺序性质，并且提供了即使在电力排序期间重新分配过程继续而没有数据丢失的保证。

公开(公告)号：WO1997030441A1

公开(公告)日：1997-08-21

申请号：PCT/US1997002451

申请日：1997-02-14

Applicant: SCOTTS VALLEY INSTRUMENTS, INC.

Inventor： SCOTTS VALLEY INSTRUMENTS, INC. ,  GARDNER, Floyd, M. ,  SAXBY, Dennis, A.

IPC: G11B05/09

CPC classification number: H04L7/0062 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10055 ,  G11B20/1426 ,  H03L7/091 ,  H04L7/0029

Abstract: Apparatus and method for sampling a partial response input signal including a signal sampler (114) for generating a sampled digital signal representation of a sampled analog signal in response to a sample-time control signal, and a timing error detector (106) having an input port receiving the digital signal and generating a timing error control signal at an output port. The timing error control signal is a function of the non-return to zero sequence which was originally recorded or otherwise transmitted or communicated, the synchronous sampled data value, the estimated ideal partial response sample value, and the timing error estimate. A voltage controlled oscillator (112) receives the timing error control signal and generates the sample time control signal.

Abstract translation: 用于采样部分响应输入信号的装置和方法，包括用于响应于采样时间控制信号产生采样模拟信号的采样数字信号表示的信号采样器（114），以及具有输入端的定时误差检测器 接收数字信号并在输出端口产生定时误差控制信号。 定时误差控制信号是原始记录或以其他方式发送或传送的不归零序列，同步采样数据值，估计的理想部分响应采样值和定时误差估计的函数。 压控振荡器（112）接收定时误差控制信号并产生采样时间控制信号。

公开(公告)号：WO1996027186A1

公开(公告)日：1996-09-06

申请号：PCT/JP1995000323

申请日：1995-03-01

Applicant: HITACHI, LTD. ,  SUZUKI, Mikio ,  NISHIDA, Yasutaka

Inventor： HITACHI, LTD.

IPC: G11B05/09

CPC classification number: G11B5/09

Abstract: The S/N of a reproduced signal can be improved by using a single-layer recording medium having vertical magnetic anisotropy without a base layer of a soft magnetic material, and a shield MR head. In this case, too, an isolated reproduction waveform is a dipulse waveform in the same way as when a ring head is used, and a processing suitable for the dipulse waveform is necessary. This can be accomplished by converting a reproduction waveform to a symmetric single-peak waveform through an RC differentiator having a suitable time constant, and then sending it to a discriminator, if desired, through a pre-amplifier and a zero-crossing detector.

Abstract translation: 可以通过使用没有软磁性材料的基底层的垂直磁各向异性的单层记录介质和屏蔽MR磁头来提高再现信号的S / N。 在这种情况下，隔离再现波形也是与使用环形头时相同的二次脉冲波形，并且需要适合于二次脉冲波形的处理。 这可以通过经由具有适当时间常数的RC微分器将再现波形转换成对称单峰波形，然后如果需要，通过前置放大器和过零检测器将其发送到鉴别器来实现。

公开(公告)号：WO1996005593A1

公开(公告)日：1996-02-22

申请号：PCT/US1995010264

申请日：1995-08-10

Applicant: MAXTOR CORPORATION

Inventor： MAXTOR CORPORATION ,  RIGGLE, C., M.

IPC: G11B05/09

CPC classification number: H03M13/6331 ,  G11B5/09 ,  G11B20/10009 ,  H03M13/41 ,  H03M13/4107 ,  H03M13/6502

Abstract: A finite impulse response (FIR) filter (100) and a Viterbi detector system (110) for a magnetic read channel (101) are disclosed. The FIR equalizer generates equalized sampled outputs to the Viterbi detector system. The Viterbi detector system determines the most probable value of all references, Ri by accumulating a summation of data sample values, Dt, for selected legal bit sequences over a significant amount of random data. The summation and count of data samples are output to a system microprocessor for calculation of an average reference for each path of the Viterbi system. The Viterbi detector system also calculates, in real time, magnitude of differences between the output data received from the FIR equalizer and transition references for each data sample to generate transition metrics, adds transition metrics to state metrics from the source node of two paths, and compares the result. The lesser of the two yields the most likely correct state metric. Encoded bit strings of finite length are updated and saved for each state. Data is output from an arbitrary bit string.

Abstract translation: 公开了一种用于磁读取通道（101）的有限脉冲响应（FIR）滤波器（100）和维特比检测器系统（110）。 FIR均衡器产生均衡的采样输出到维特比检测器系统。 维特比检测器系统通过在大量的随机数据上累积所选择的合法比特序列的数据样本值Dt的求和来确定所有参考的最可能的值。 将数据样本的求和和计数输出到系统微处理器，以计算维特比系统的每个路径的平均参考值。 维特比检测器系统还实时地计算从FIR均衡器接收的输出数据与每个数据样本的转换参考之间的差异的大小，以产生转换度量，将转移度量添加到来自两个路径的源节点的状态度量，以及 比较结果。 两者中较小者产生最可能的正确状态度量。 对每个状态更新和保存有限长度的编码位串。 数据从任意位串输出。