I need mathematical model of Hard Disk

Hello
Please I want your help for provide me mathematical model of cpu and another of Hard DIsk ,i need understand thermal behavior

I am not working in Modeling to use Software ,The Idea that I want Ready Mathematical Model for Processor Whatever And Another for HardDisk Whatever ,I want to understand these Models and Thinking for strategy for cooling

Demonstration:as The Processor has exponential equations expressed of its thermal behavior example(Temperature Rise Equations and Temperature Fall Equations and so on)

this Link for Display mathematical/thermal model of CPU(single core)

I find Equations for Hard Disk Like as Processor???