Hard Drive Command Capture and Sequential Stream Detection

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The latency time, which is the residual vibration of afine actuator and track eccentricity, has been the aim for direct pull-in in optical disk system. Modified velocity profiles of the coarse actuator and control inputs of the fine actuator have been proposed for the minimum residual vibration. Generally, there exists eccentricity due to mismatch of the disk center and the axis of a spindle mo...

In emerging analytical database applications that deal with large sets of multidimensional static data sets, the performance of the query system significantly depends on the performance of its access methods and the underlying disk system. In recent years, hard disks are manufactured with multiple physical zones, where seek times and data transfer rates vary significantly across the zones. Howe...

Advances in computing power. Computer processing speeds have increased a thousand-fold since the first microprocessor was introduced. The size of dynamic memory, which is used for active storage of the program code that is being executed, has reached capacities that exceed what used to be the standard for physical storage of data on a disk. These advances in processing speed and capacity have b...

The condensation of matter from a corona to a cool, optically thick inner disk is investigated for black hole X-ray transient systems in the low hard state. A description of a simple model for the exchange of energy and mass between corona and disk originating from thermal conduction is presented, taking into account the effect of Compton cooling of the corona by photons from the underlying dis...

Three readback signal detection methods are inyestgated for real-time flying height or head disk spacing variation measurement under vibration conditions. This is carried out by theoretical analysis, numerical simulation, and experimental study. The first method (amplitude detection) provides a simple way to study the head disk spacing change. The second method ( PW50 parameter estimation) can ...

Despite recent increases in the processing power of handheld computers, often called palmtops, the devices continue to function primarily as personal information organizers. We believe adding mass storage to handheld computers will expand the usefulness of the devices. We propose a storage hierarchy, involving a hard disk and large software controlled flash memory cache, that lowers the power c...