I am on Arch Linux and I want to disable this activity indicator light on a WD hard drive. I know there is a software on Windows for doing that, but since I am on Linux, how could I do it? This light is annoying when I am in a dark room.
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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I mean messing with circuitry around a hard drive can also be problematic
Not really. You're not messing with the hard drive itself at all. A hard drive is a sealed component. Unless you're taking an extremely strong magnet near it, dripping it, or trying to directly inject power to the pins on the drive, there is no risk of damaging it.
You're messing with the plastic shell and maybe a small board that handles low power conversion and the LED. These are very simple things.