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Drive head flying high micro-control -related technology research

Author: XuBaoLiang
Tutor: ChenJinCai
School: Huazhong University of Science and Technology
Course: Computer System Architecture
Keywords: Flying High Hot prominent Flying high thermal control
CLC: TP333.35
Type: Master's thesis
Year: 2011
Downloads: 42
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Abstract

With increased recording density, high-flying disk head getting lower and lower. As head-disk spacing into the nano-scale, head disc system analysis of the interaction between the traditional model has failed, and thus under the conditions of ultra high-flying head disk systems analysis and implementation technology challenges. Because even the nano-scale high-flying head disk system will also damage the stability and reliability of the significant impact that it might encourage slider and disk contact, causing the head to read and write failures and data loss, the impact head read write speed and accuracy. During a write operation of the head, the write coil is energized and the heat generated by the heat of the surrounding environment will cause thermal expansion of write heads, thereby affecting the read head disk interface in the distance between the head and the disk. The read operation is performed by reading data magnetoresistance effect, does not require additional power, does not cause thermal expansion of the head. To avoid a write operation occurs during the collision head disk interface, the head of the read operation must maintain a sufficient margin, to fly a little higher, which is currently flying high impact to further reduce the biggest obstacle. To solve this problem, reduce the loss of flying high, we propose a high-flying control technology, that fly high thermal control slider. Flying high heat control slider from the basic structure, combined with the head disc interface structure, detailed analysis of the micro-heater to heat the slider flying height control stability. Flying high heat given finite element model of the slider control and simulation of structures, systems, discusses the impact on system stability throughout Appetizers various factors such as the size of micro-heaters, micro-heater heating coil input current, micro- the heater and the air bearing surface and the distance. The various factors were specific analysis, based on the analysis of the simulation of these factors on the impact of the entire head disk systems, and micro-heater heating coils were studied. Through the system simulation, the results showed that: increases micro-heater input current can lead to better heating performance, reduce flying high, but the thermal response time but did not significantly reduce; decrease slightly between the heater and the air bearing surface of the not only increases the distance of the heating performance of the system, but also increases the thermal response time; reduce the size of the micro-heater can effectively increase the heating performance of the system, but the thermal response time not significantly reduced; micro-heater as a heating coil The heating system has significant implications for the performance of its structure and winding way analyzed. The simulation results as a guide carriage actual thermal fly height control system is designed to provide a theoretical basis.

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