Seagate Technology Incorporated

LingZhi Yang

Kenneth Lawrence Barham

David L Schell

Abhay Tejmal Kataria

Christopher R Fulkerson

Sandeep Dominic Sequeira

Dipeshkumar J Purani

Jeffrey Vincent DeRosa

Richard Edward Martin

KarWei Koay

Ximin Shan

Richard Arthur Herr

Jonathan Harrington Ormsby

SangHoon Lee

Alexander T Le

Salman Al Saif

A background operation is internally triggered by firmware of a disk drive. During a training phase defined by a first time period, access latency of host commands is monitored during rotational position sorting command selection. During a sorting phase after the training phase, a sorting threshold is defined based on the access latencies measured during the training phase. The background command is selected for execution in the sorting phase if the seek and rotational latency is less than the sorting threshold.

Apparatus and method for executing background operations using rotational position sorting

Systems and methods are disclosed for probabilistic aging command sorting, including adjusting an execution order for a command based on a probability of the command reaching a time out threshold. The system may determine a probability of a command timing out using a lookup table for a base queue depth, modified by a scalar value obtained from a queue depth adjustment lookup table using the actual queue depth as an index. In this manner, an accurate probability of a command timing out for a given queue depth can be determine without significant computational overhead.

Probabilistic aging command sorting

An apparatus includes a buffer and a processor. The buffer contains a plurality of commands pending for a data storage medium. The processor is configured to sort the commands in an execution efficiency favorable manner, which reveals a most favorable command for execution, compare a skip count for each of the commands to a threshold count, the skip count corresponding to a number of times execution of the command has been skipped in favor of execution of another command, and execute one of the commands having a skip count that has reached the threshold count over the execution of the most favorable command.

Prioritizing commands in a data storage device

Apparatus and method for managing a data storage device during extended idle conditions of the data storage device in which host access commands are not being received or serviced. In some embodiments, upon detection of an idle condition, a control circuit identifies a selected data transducer of the data storage device and a corresponding initial radial position of the data transducer with respect to an associated rotatable data recording surface. The control circuit performs a serpentine seek operation during the idle condition to gradually advance the selected data transducer in a selected radial direction across the data recording surface beginning at the initial radial position and ending at a final radial position. The serpentine seek operation prevents the transducer from being maintained in a stationary position during the idle condition, reducing the likelihood of damage through thermal asperity contact events, lubrication disturb, wear, etc.

Serpentine seeks during data storage device idle periods

A data storage device may generally be directed to a buffer that stores a plurality of command requests pending for a data storage medium and a processor that is configured to skip a first command request and execute a second command request in response to the second command request having an access latency within a first predetermined performance impact range and a power consumption within a second predetermined power savings range compared to the first command request.

Performance and power management for rotating data storage device

Apparatuses and methods are disclosed that relate to movement of actuator arms from a stopped position. In one example, a method may include attempting to unlatch an actuator arm from a stop and measuring an electrical parameter of a driver circuit of the actuator arm. The method may further include detecting an unsafe unlatch event using a controller when the electrical parameter does not exceed a first threshold within a predetermined period of time.

Actuator arm unlatching

A method of calibrating an actuator controller is discussed. The method includes using an open loop seek operation and compensating for a low frequency response to reduce the velocity at the end of the open loop seek operation.

Open loop Ka calibration with low frequency compensation

Various embodiments are generally directed to moving a control object using a sine-based trajectory profile with an initial non-zero velocity.

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Longmont, CO, United States of America

LingZhi Yang