Patent application number | Description | Published |
20090185309 | Method for Minimizing Contaminant Levels Within a Tape Drive System - A method for minimizing dust level within a tape drive system is disclosed. A dust concentration level within the tape drive system is initially determined. A head brush interval is subsequently adjusted according to the determined dust concentration level within the tape drive system. | 07-23-2009 |
20090185310 | Method for Providing Contaminant Prevention and Removal from a Tape Drive System - A method for preventing dust from entering a tape drive system is disclosed. Initially, a cooling fan is allowed to rotate in one direction to provide airflow to the tape drive system. In response to a detection of a loading or unloading of a tape cartridge or a head brush operation, the cooling fan is allowed to rotate in a different direction to provide airflow in an opposite direction in order to blow any dust and debris, which may be introduced from a tape cartridge or may already be resident on a tape head, out the front of the tape drive system. | 07-23-2009 |
20090213489 | METHOD AND SYSTEM FOR SERVO STRIPE WIDTH DETECTION AND COMPENSATION - A method and system for servo stripe width detection and compensation including moving a magnetic tape in a first direction across a magnetic tape head, the magnetic tape having a servo band including a first servo pattern and a second servo pattern, the magnetic tape head having a servo element; detecting a leading edge and a trailing edge of the first servo pattern with the servo element; detecting a leading edge and a trailing edge of the second servo pattern with the servo element; determining a first time from the leading edge of the first servo pattern to the leading edge of the second servo pattern; determining a second time from the trailing edge of the first servo pattern to the trailing edge of the second servo pattern; and determining a correction value from a difference between the first time and the second time. | 08-27-2009 |
20100177885 | METHODS TO FACILITATE ENCRYPTION IN DATA STORAGE DEVICES - Methods are provided for managing data encryption for a data storage library. An implementation assessment is performed for a customer and, in response to the implementation assessment, a set of customizations are generated for an encryption command communications appliance to enable the appliance to communicate with an encryption-capable storage device and a data storage library controller within the data storage library and with an encryption key manager (EKM) coupled to the data storage library. The encryption command communications appliance is configured with the set of customizations and the configured encryption command communications appliance is installed in the data storage library coupled to the library controller, the storage device and the EKM. | 07-15-2010 |
20100177901 | SYSTEM AND SERVICE TO FACILITATE ENCRYPTION IN DATA STORAGE DEVICES - An encryption communications appliance provides data encryption management for a data storage library. The appliance is coupled to an encryption-capable storage device, a data storage library controller within the data storage library and with an encryption key manager (EKM). The encryption command communications appliance intercepts encryption key requests from the data storage device and transparently forwards the requests to the EKM. The appliance also forwards transparently communications between the library controller and the data storage device. | 07-15-2010 |
20100302666 | DETECTING A PERIODIC SEQUENCE OF SERVO SIGNALS - A system and method are disclosed for detecting a periodic sequence. A value detector module detects a plurality of values of a periodic sequence. In one embodiment, a transformation module transforms the plurality of values into transformed values. A confinement module confines the values to a limited set of confined values. A correlation module correlates the confined values with a plurality of instances of the periodic sequence. In addition, a selection module selects an instance of the periodic sequence with the highest correlation to the confined values as an observed periodic sequence. | 12-02-2010 |
20110102934 | CANCELLATION OF TIME-VARYING PERIODIC DISTURBANCES IN SERVO CONTROL SYSTEMS - Various embodiments for addressing time-varying periodic disturbances in a servo control system are provided. Each of a plurality of coefficients is updated based on an estimation of at least one disturbance frequency. The updated plurality of coefficients is provided to at least one peak filter modifying an input signal of the servo control system. The peak filter is operable in view of the updated plurality of coefficients to cancel at least one of the time-varying periodic disturbances. | 05-05-2011 |
20110134556 | Detection and Acquisition of a Servo Pattern Subject to Lateral Motion - A method, a servo system and a tape drive are provided to acquire lock on a servo signal. The servo signals of at least one servo element are monitored to detect a valid servo signal. If a valid servo signal is not detected than the fine actuator is moved in a first direction until either a valid servo signal is detected or the fine actuator travel limit is reached. When a valid servo signal is detected, the fine actuator is set to a neutral position and the coarse actuator is moved in the first direction. When the fine actuator travel limit is reached the fine actuator is moved to the first position and the coarse actuator is moved in a second direction, opposite of the first direction. | 06-09-2011 |
20110170214 | SYSTEMS AND METHODS FOR CORRECTING MAGNETIC TAPE DIMENSIONAL INSTABILITY - Magnetic tape devices encounter read and/or write errors when the tape is not being passed across the head with the proper tension and/or skew angle. According to one embodiment, a system which corrects for these problems comprises a head having an array of at least one of readers and writers, a drive mechanism for passing a magnetic recording tape over the head, a skew-inducing mechanism coupled to the head for adjusting a skew angle of a longitudinal axis of the array relative to a direction normal to a direction of tape travel over the head, and a controller in communication with the head. The system also determines a tape dimensional stability state of the tape and adjust the skew angle away from normal to the direction of tape travel and lowers a tension of the tape across the head if the tape dimensional stability state is in a contracted state. | 07-14-2011 |
20110176237 | MAGNETIC TAPE SERVO FORMAT ALLOWING FOR INCREASED LINEAR TAPE DENSITY AND SYSTEMS THEREOF - According to one embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars having an average height of between about 80 microns and about 120 microns, wherein an average stripe angle of the bars is between about 10° and about 25°. A stripe angle is measured between a longitudinal axis of each respective bar and a line oriented perpendicular to a direction of tape travel and parallel to a plane of the tape, wherein an average stripe width of the bars is between about 1.0 micron and about 2.2 microns and an average servo frame length of groups of the bars comprising a servo frame is between about 120 microns and about 180 microns. In more embodiments, a servo format and a system including a servo format are disclosed, along with other embodiments of magnetic tapes. | 07-21-2011 |
20110199701 | SKEW ACTUATOR TO SERVO TRACK ZERO REFERENCE - A servo detection system for detecting servo tracks of a longitudinal tape. In a read/write head, two servo read heads are spaced laterally on a first head module, and a servo read head is on a second head module spaced longitudinally from the first module. A method comprises initially sensing a tape servo track with one servo read head of the first module and the servo read head of the second module to determine skew misalignment of the servo track. A zero reference value is stored representing the determined skew misalignment. The detection system switches from the one servo read head of each module, to the two servo read heads of the first module, and employs the stored value to position the read/write head in the zero skew position. The two servo read heads are then employed to read two servo tracks to identify the data band and to control skew. | 08-18-2011 |
20110216434 | TIMING ALTERNATIVE INTERVALS WITHIN A TIMING BASED SERVO BAND - An alternative time interval is taken of a timing based servo band to determine lateral position of a servo read head. The servo band is arranged in a sequence bursts with non-parallel servo stripes in sequentially adjacent sub-frames of a linear tape. The timing intervals comprise at least a first time interval (A) between a first pair of non-parallel servo stripes of a sub-frame; and an alternative time interval (C) between a pair of non-parallel servo stripes intermediate the first time intervals (A), the alternative interval servo stripes of sequentially adjacent sub-frames comprising a second servo stripe of the first pair, and a first servo stripe of a sequentially succeeding first pair. Position signals are ratios involving the first and second time intervals. | 09-08-2011 |
20110216441 | APPLICATION OF CONTINUOUS POSITION ERROR OFFSET SIGNAL TO ACQUIRE SERVO TRACK - The method employs a servo system for positioning a head laterally to follow lateral motion of a longitudinal tape having longitudinal defined servo track(s), the servo system comprising a servo element configured to sense lateral position of the head with respect to an acquired servo track, a fine actuator configured to translate the head laterally with respect to the longitudinal tape, and a position error signal loop to operate the fine actuator to translate the head laterally to reduce position error. If the servo element is positioned away from the defined servo track(s), a continuous position error offset signal is applied to the fine actuator in a direction towards the defined servo track(s), whereby the fine actuator translates the head in accordance with the continuous position error offset signal; and, in response to the servo system acquiring the defined servo track(s), the continuous position error offset signal is discontinued. | 09-08-2011 |
20110273793 | DETERMINATION OF TIMING BASED SERVO PATTERN TYPE - In a magnetic tape drive having a servo read system with at least one read head, the system configured to read servo pattern information as a magnetic tape is moved longitudinally with respect to the at least one read head, the servo pattern comprising a timing-based servo pattern comprising an even number of bursts of sloped magnetic stripes, adjacent bursts oppositely sloped, alternate bursts identically sloped, an embodiment of a method determines the time between detection from the read head of a same stripe of alternate bursts of a pattern; determines the time between detection from the read head of stripes of a burst of a pattern; and determines a ratio of the determined times. The ratio is compared to a threshold, wherein the threshold comprises a differentiation between different servo pattern types. | 11-10-2011 |
20120300337 | HEAD WRAP PROCEDURE - According to one embodiment, a method includes tracking a magnetic tape moving in a first direction using at least one reader of an inner module of a head having at least the inner module and first and second outer modules positioned on opposite sides of the inner module and aligned with the inner module in a tape travel direction, detecting a signal using at least one reader of the first outer module as the tape passes thereacross, moving a guide positioned in front of the first outer module in a direction towards the tape until the signal detected by the first outer module decreases by a predetermined amount, and moving the guide directionally away from the tape to a position to set about a predetermined wrap angle of the tape relative to the first outer module after the signal detected by the first outer module decreases by the predetermined amount. | 11-29-2012 |
20120307390 | SYSTEM, METHOD, AND COMPUTER PROGRAM PRODUCT FOR FAST RECOVERY TO A WRITE STATE - In one embodiment, a tape drive system includes a magnetic head having at least one servo sensor for track-following at least one defined servo track of a longitudinal tape, a tape motion controller configured to move the longitudinal tape past the magnetic head, a compound actuator configured to translate the magnetic head laterally with respect to the longitudinal tape, and a control configured to track-follow the at least one defined servo track by reducing a position error between the magnetic head and a desired position, transition from a write state to a monitor state when the position error is greater than a threshold, transition from the monitor state to a stop write state when the position error is greater than the threshold for a first period, and transition from the monitor state to the write state when the position error is less than the threshold for a second period. | 12-06-2012 |
20120307391 | SYSTEM, METHOD, AND COMPUTER PROGRAM PRODUCT FOR SERVO COMPENSATOR SWITCHING IN HIGH VIBRATION ENVIRONMENTS - A tape drive system according to one embodiment includes a magnetic head having at least one servo sensor; a tape motion controller; a fine actuator; a skew actuator; a coarse actuator; and a control. The control is configured to perform various operations that help account for vibrations that effect track-following a servo track when operating a tape drive. Additional systems, methods and computer program products are also described. | 12-06-2012 |
20120307392 | METHOD FOR FAST RECOVERY TO A WRITE STATE - In one embodiment, a method includes sensing a servo sensor while a longitudinal tape is moved past a magnetic head, determining position error between the magnetic head and a desired position related to the at least one defined servo track; providing signals to operate a fine actuator to translate the magnetic head laterally in a manner to reduce the determined position error; transitioning from a write state to a monitor state when the determined position error is greater than a threshold error value; transitioning from the monitor state to a stop write state when the determined position error is greater than the threshold error value for a first predetermined period; and transitioning from the monitor state to the write state when the determined position error is less than the threshold error value for a second predetermined period. | 12-06-2012 |
20120307401 | SYSTEM AND METHOD FOR FAST CENTER CALIBRATION OF A TAPE DRIVE FOR A FLANGELESS TAPE PATH - A servo system according to one embodiment includes at least one servo sensor for sensing a lateral position of a magnetic head with respect to at least one defined servo track of a longitudinal tape; a fine actuator configured to translate the magnetic head laterally with respect to the longitudinal tape; a coarse actuator configured to translate the fine actuator laterally with respect to the longitudinal tape; and a servo control. The servo control is configured to perform various operations that may be used to estimate a midpoint of lateral tape excursion of a flangeless tape path for calibrating a tape drive. Additional systems are also presented. | 12-06-2012 |
20120307402 | METHODS FOR FAST CENTER CALIBRATION OF A TAPE DRIVE FOR A FLANGELESS TAPE PATH - According to one embodiment, a method includes sensing a first servo sensor while a longitudinal tape is moved in a first direction; determining position error between the magnetic head and a desired position related to the at least one defined servo track; providing signals to operate a fine actuator to translate the magnetic head laterally in a manner to reduce the determined position error; calculating a first average position of the magnetic head for at least one first run-out cycle while the longitudinal tape is moved in the first direction; calculating a first offset of the magnetic head while the longitudinal tape is moved in the first direction; operating a coarse actuator to position the coarse actuator substantially at a target position using the first offset and the first average position. | 12-06-2012 |
20130063836 | TAPE DRIVE PROVIDED WRITE FORMAT FOR OVERWRITE ERASURE OF MAGNETIC TAPE DATA RECORDED IN TRACKS - A magnetic tape drive has a drive system to move a magnetic tape longitudinally; servo head(s) for reading servo band information from a magnetic tape as the magnetic tape is moved longitudinally; a magnetic tape read write head configured to read and to write the magnetic tape, having a data write width (w) greater than a normal shingled track pitch width (p) of the magnetic tape; an actuator system for positioning the read write head laterally; and a control. The magnetic tape drive stores an overwrite erase format of non-shingled track pitch longitudinal pattern(s) whose pitch is greater than the normal shingled track pitch width (p); and, the control, in response to activation of overwrite erasure of the tape drive, operates the actuator system and the magnetic tape read write head to write non-data to magnetic tape in the stored overwrite erase format. | 03-14-2013 |
20130175954 | DYNAMIC RECONFIGURATION-SWITCHING OF WINDINGS IN AN ELECTRIC MOTOR USED AS A GENERATOR IN AN ELECTRIC VEHICLE - For an electric motor used as a generator in an electric vehicle for dynamic braking, employing a dynamic reconfiguration-switching of motor windings upon the generator exceeding one of a maximum usable constraint of a first rechargeable battery in order to reduce a voltage constant of the electric motor thereby limiting one of a produced voltage and a produced power. | 07-11-2013 |
20130175966 | DYNAMIC RECONFIGURATION-SWITCHING OF WINDINGS IN A MOTOR USED AS A GENERATOR IN A TURBINE - For a motor used as a generator, employing a dynamic reconfiguration-switching of motor windings upon the generator, used in a turbine, exceeding a maximum usable constraint of a first direct current (DC)-to-alternating current (AC) inverter in order to reduce a voltage constant of the motor thereby limiting one of a produced voltage and a produced power. | 07-11-2013 |
20130176642 | SELECTIVELY LOWERING RESISTANCE OF A CONSTANTLY USED PROTION OF MOTOR WINDINGS IN DISK DRIVE - Dynamic reconfiguration-switching of motor windings in a disk drive is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity. | 07-11-2013 |
20130222940 | MAGNETIC TAPE SERVO FORMAT ALLOWING FOR INCREASED LINEAR TAPE DENSITY AND SYSTEMS THEREOF - In one general embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars, wherein an average stripe width of the bars is between about 1.0 micron and about 2.2 microns, where an average servo frame length of groups of the bars comprising a servo frame is between about 120 microns and about 180 microns. In another general embodiment, a system includes a head having at least one servo reader and an array of data transducers of a type selected from a group consisting of readers and writers; and a controller operative to selectively enable every other transducer of a particular type in the array in a first mode of operation, and operative to selectively enable every transducer of the particular type in the array in a second mode of operation. | 08-29-2013 |
20130229136 | SELECTIVELY LOWERING RESISTANCE OF A CONSTANTLY USED PORTION OF MOTOR WINDINGS IN AN ELECTRIC MOTOR - Dynamic reconfiguration-switching of motor windings in a motor is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity. | 09-05-2013 |
20130265671 | SYSTEM FOR FAST CENTER CALIBRATION OF A TAPE DRIVE FOR A FLANGELESS TAPE PATH - A servo system according to one embodiment includes a servo control configured to: determine position error between a magnetic head and a desired position related to at least one defined servo track on a longitudinal tape based on at least one servo signal; calculate a first average position of the magnetic head while the longitudinal tape is moved in a first direction; calculate a first offset of the magnetic head while the longitudinal tape is moved in the first direction based on a target position and an assumption that the first average position of the magnetic head occurred when the tape was at a top-most position or a bottom-most position of a supply reel; and operate an actuator to position the actuator substantially at the target position using the first offset and the first average position | 10-10-2013 |
20130286503 | HEAD WRAP PROCEDURE - A method according to one embodiment includes detecting a signal originating from at least one reader of a first outer module of a head as a tape passes thereacross, the head having at least the first outer module and a second outer modules positioned on opposite sides of an inner module and aligned with the inner module in a direction of tape travel thereacross. A first guide positioned in front of the first outer module is moved in a direction towards the tape until the signal detected by the first outer module decreases. The first guide is moved in a direction away from the tape to a position to set about a predetermined wrap angle of the tape relative to the first outer module after the signal detected by the first outer module decreases. | 10-31-2013 |
20130335857 | VIBRATION DISTURBANCE ESTIMATION AND CONTROL - A tape drive configured to accurately position a head actuator in the presence of physical disturbances is disclosed. The tape drive includes a track-follow controller to position a head actuator over data tracks on magnetic tape. The tape drive further includes a disturbance observer configured to estimate a vibration disturbance and output a compensation signal to assist the track-follow controller to accurately position the head actuator over the data tracks in the presence of vibration. When estimating the vibration disturbance, the disturbance observer takes into account vibration frequency characteristics, such as frequency characteristics derived from a vibration specification associated with the tape drive, or frequency characteristics derived from known vibration disturbances experienced by the tape drive. A corresponding method is also disclosed. | 12-19-2013 |
20140016226 | DETERMINING A SKEW ERROR SIGNAL (SES) OFFSET USED TO DETERMINE AN SES TO ADJUST HEADS IN A DRIVE UNIT - Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads. | 01-16-2014 |
20140022666 | VARIABLE STOPWRITE THRESHOLD WITH VARIABLE SMOOTHING FACTOR - In one embodiment, a data storage system includes a head; a drive mechanism for passing a medium over the head; a controller electrically coupled to the head; logic encoded in or available to the controller for: periodically determining a stopwrite threshold based on a standard deviation or a variance at a current position error signal sample, wherein a smoothing factor applied to a subsequent calculation of the standard deviation or variance is altered based at least in part on a current magnitude of the standard deviation or the variance; determining whether the current position error signal sample exceeds the stopwrite threshold; disabling writing when the current position error signal sample exceeds the stopwrite threshold; and enabling writing when the current position error signal sample does not exceed the stopwrite threshold. Other systems, methods, and computer program products are described according to more embodiments. | 01-23-2014 |
20140022667 | TIMING-BASED SERVO FOR DETERMINING LATERAL HEAD VELOCITY - A servo track has identical servo pattern frames including two pairs of parallel magnetic transitions, the transitions of each pair spaced apart an equal distance, the transitions of the first pair at an azimuth angle to the longitudinal axis of the tape, the transitions of the second pair at an opposite azimuth angle. A servo channel receives signals at first times corresponding to when a servo read head detects the first and second transitions of the first pair of parallel transitions of a servo pattern frame, and second times corresponding to when the servo read head detects the first and second transitions of the second pair of parallel transitions. The servo channel determines a relative lateral movement and velocity between the tape and the tape head based on the azimuth angle and the ratio of the difference of the first and the difference of the second times. | 01-23-2014 |
20140029130 | METHOD AND APPARATUS FOR OPERATING A TAPE STORAGE DEVICE - In a method for operating a tape storage device comprising a tape head for reading and/or writing data from/to a tape in the tape storage device, a first tape skew value concerning a skew of the tape is determined and the first tape skew value is converted into a first skew control signal by means of a skew feedback controller. A second tape skew value concerning the skew of the tape is determined, and the second tape skew value is converted into a second skew control signal by means of feed-forward controller. At least one compensation signal for the second skew control signal is determined, and at least one of a rotational orientation of the tape head and a tape motion direction of the tape is controlled dependent on the second skew control signal and the compensation signal in case the first skew control signal fails. | 01-30-2014 |
20140036386 | TIMING-BASED SERVO FOR DETERMINING LATERAL HEAD VELOCITY - A servo track has servo pattern frames including two pairs of parallel transitions, the transitions of each pair spaced apart an equal distance, the first pair at an azimuth angle, the second pair at the opposite azimuth angle. A servo channel receives signals at first times corresponding to a servo read head detecting the transitions of the first pair of parallel transitions of a servo pattern frame, and second times corresponding to the servo read head detecting the transitions of the second pair of parallel transitions. The servo channel determines a relative lateral movement and velocity between the tape and the tape head based on respective functions of the ratio (T | 02-06-2014 |
20140063643 | TENSION TRANSIENTS SUPPRESSION DURING ACCELERATION AND/OR DECELERATION FOR STORAGE TAPE DRIVE - In one embodiment, a system includes a controller configured to: determine a reference velocity at various intervals, receive or determine a secondary velocity based at least in part on a parameter associated with a drive mechanism motor, determine a value representative of a difference between the reference velocity and secondary velocity, adjust a speed of the motor of the drive mechanism for minimizing the difference between the reference velocity and secondary velocity, receive/determine a primary velocity based on reading information encoded on a magnetic tape, at a switching point, make the reference velocity about equal to the primary velocity, after the switching point, determine the reference velocity at various intervals, after the switching point, determine a value representative of a difference between the reference velocity and primary velocity, and adjust the speed of the motor of the drive mechanism for minimizing the difference between the reference velocity and primary velocity. | 03-06-2014 |
20140126080 | TENSION TRANSIENTS SUPPRESSION DURING ACCELERATION AND/OR DECELERATION FOR STORAGE TAPE DRIVE - A method according to one embodiment includes receiving or determining primary velocity based on at least c of reading information encoded on a magnetic tape and a parameter associated with a motor of a drive mechanism. At a switching point, a reference velocity is made about equal to the primary velocity. After the switching point, the reference velocity is determined at various intervals. Also after the switching point, a value representative of a difference between the reference velocity and the primary velocity is determined, and a speed of the motor of the drive mechanism is adjusted for minimizing the difference between the reference velocity and the primary velocity. A system according to one embodiment includes a controller for controlling a drive mechanism, the controller being configured to perform the foregoing method. | 05-08-2014 |
20140126082 | FAST RECOVERY TO A WRITE STATE - Aspects of the present invention relate to an apparatus and corresponding method that includes transitioning from a monitor state to a stop write state when a determined position error is greater than a threshold error value for a first predetermined period, and transitioning from the monitor state to a write state when the determined position error is less than the threshold error value for a second predetermined period. Write operations are enabled and signals are provided to operate an actuator to translate a magnetic head laterally in a manner to reduce the determined position error while in the write state. Write operations are disabled and signals are provided to operate the actuator to translate the magnetic head laterally in a manner to reduce the determined position error while in the monitor state. Write operations are disabled while in the stop write state. | 05-08-2014 |
20140211335 | VARIABLE STOPWRITE THRESHOLD WITH VARIABLE SMOOTHING FACTOR - In one embodiment, a method includes updating a standard deviation or a variance based on a current position error signal sample, where a smoothing factor applied to a subsequent calculation of the standard deviation or variance is dynamically altered based at least in part on whether a current value of the standard deviation or the variance is above or below a specified value. A determination is made as to whether the standard deviation or the variance exceeds a predetermined threshold. A stopwrite threshold is determined based on the standard deviation or the variance when the standard deviation or the variance exceeds the predetermined threshold. A determination is made as to whether the current position error signal sample exceeds the stopwrite threshold. Writing is disabled when the current position error signal sample exceeds the stopwrite threshold. Writing is enabled when the current position error signal sample does not exceed the stopwrite threshold. | 07-31-2014 |
20140268409 | DETERMINING A SKEW ERROR SIGNAL (SES) OFFSET USED TO DETERMINE AN SES TO ADJUST HEADS IN A DRIVE UNIT - Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads. | 09-18-2014 |
20140327985 | ADJUSTING TENSION IN A TAPE MEDIA TO COUNTER TAPE DIMENSIONAL STABILITY (TDS) ERRORS IN A TAPE MEDIA - Provided are a method, system, and program for adjusting tension in a tape media to counter tape dimensional stability (TDS) errors in a tape media. A determination is made of whether to adjust tension of the tape media based on a detected error rate of reading at least one of the tracks. The tension of the tape media is adjusted in response to determining to adjust the tension. | 11-06-2014 |
20150069947 | DYNAMIC RECONFIGURATION-SWITCHING OF WINDINGS IN AN ELECTRIC MOTOR - Dynamic reconfiguration-switching of motor windings is optimized between winding-configurations. Acceleration is traded off in favor of higher velocity upon detecting an electric motor is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity. | 03-12-2015 |