Internet Explorer > JavaScript Timer Frequency: If you never use Internet Explorer, you can ignore this setting.
So, depending on your PC, this setting may do nothing at all. This option only affects internal physical hard disk drives-you know, the mechanical ones with spinning magnetic platters-and not modern solid-state drives (SSDs). However, powering off the hard disk too aggressively will hurt performance, as it takes a moment to spin back to life. Powering off the hard disk when it’s not used will save power and increase your PC’s battery life. Your hard disk is powered off, but your PC will turn it on again as soon as it’s needed.
Hard Disk > Turn Off Hard Disk After: Windows usually turns off your hard disk when your PC is idle, and this lets you control how many minutes before that happens. The power plan you’re currently using is marked “.” The box at the top of the window lets you quickly select between your system’s power plans so you can adjust all their settings from this window.
