HDD heads have various interaction modes with thermal asperities (TAs), and protection mechanisms need to be put in place to ensure the head–disk interaction (HDI) resulting from them is eliminated or minimized to the highest extent possible. We propose a method to reduce such head–disk interaction (HDI) during TA detection and classification by flying higher at low thermal fly-height control (TFC) power, which minimizes the interaction of the TA with the head. The key idea is to scan the head at higher fly height, but with higher ECS bias voltage. By mapping out these TAs and ensuring the head does not fly over them again to prevent HDI, the fly height can then be lowered, and the rest of the TA cluster can be scanned. Following this method iteratively, the entire TA cluster can be mapped out with minimal interaction with the head. Although this method entails an increase in the test time to detect and map all TAs, compared to detecting them with TFC being on, this can help improve the reliability of the drive by protecting the sensitive read/write elements especially for energy assisted recording from HDI. Other than track follow, TA interactions also occur when the head seeks across the tracks. Typical seek avoidance attempts to eliminate TA interaction during seeking, however it is not straightforward to determine which of the seek mechanism: TFC on during short seeks, retract/arrival during long seeks, interaction with high TAs (HTAs), whose height is more than the fly height of the head during long seeks with TFC off, or idle TA interaction causes the greatest HDI. Through theoretical analysis and experimental corroboration, this paper intends to rank the various modes of TA interaction, so by developing features for eliminating or minimizing them in that order could help bring the maximum benefit for achieving minimum lifetime reduction of the head due to such interaction.

HDD磁头具有各种带有热粗糙（TAs）的交互模式，并且需要采用保护机制以确保消除或最小化由此导致的磁头-磁盘交互（HDI）。我们提出了一种方法，可通过在低热飞高控制（TFC）功率下飞得更高来减少TA与磁头之间的相互作用，从而减少TA检测和分类过程中的此类磁头-磁盘相互作用（HDI）。关键思想是在较高的飞行高度（但具有较高的ECS偏置电压）下扫描磁头。通过绘制这些TA并确保头部不会再次飞过以防止HDI，可以降低飞行高度，然后可以扫描TA簇的其余部分。反复遵循此方法，可以在与头部的交互最少的情况下映射整个TA群集。尽管此方法需要增加检测和映射所有TA的测试时间，但与在启用TFC的情况下进行检测相比，这可以通过保护敏感的读/写元素（尤其是用于HDI的能量辅助记录）来帮助提高驱动器的可靠性。 。除了磁道跟踪之外，当磁头在磁道上搜寻时，也会发生TA交互作用。典型的寻道规避尝试会消除寻道过程中的TA交互作用，但是要确定哪种寻道机制并不容易：在短寻道过程中TFC开启，在长寻道过程中缩回/到达，与高度大于（TA）的高TA（HTA）交互作用TFC关闭或长时间TA交互时，长时间搜寻时头部的飞行高度会导致最大的HDI。通过理论分析和实验证实，