I would like to install Linux on an old laptop. what is the best Linux distribution for weak hardware on a mechanical HDD, I already use Linux mint on my main computer but I would like something more lightweight for an pentium based laptop
user
I can. say there is a best Linux distro for you, as it depends heavily on your personal preferences. 

However, if you have some experience with Linux already, you can try installing Arch Linux for a more lightweight, DIY experience, where you will have granular control of exactly what you install, and with some elbow grease, customize your OS exactly the way you want it, for weak and strong hardware. 

The other feature of Arch is that it is a rolling release distribution, which means you will always have the latest software and kernel available to you.

Finally, with the excellent documentation on the Arch Linux wiki, you will also gain a much better understanding of Linux in general.
assistant
what Linux hardware is light and compact in terms of physical appearance?
user
If you're looking for light and compact hardware that can run Linux, there are several options available. Some of the popular choices include:

Raspberry Pi: A popular single-board computer that can run various Linux distributions. It's small, affordable, and versatile, making it suitable for various projects and lightweight computing needs.

Pinebook: Pine64 offers the Pinebook and Pinebook Pro, which are affordable ARM-based laptops that run Linux. These laptops are lightweight and compact, with a focus on energy efficiency and low cost.

GPD Pocket: The GPD Pocket is a small, ultra-portable laptop with a 7-inch screen that runs Linux. It features an Intel Atom processor and is designed for on-the-go computing.

Star Lite: Star Labs offers the Star Lite laptop, which is an ultraportable Linux laptop with an 11.6-inch screen. It's designed for users who want a compact and lightweight device with good performance.

These are just a few examples of lightweight and compact Linux hardware options. Keep in mind that your choice will depend on your specific needs, preferences, and budget.
assistant