Mechanical hard drives can be very fast when reading sequential files, such as copying movies. But when we usually use the operating system, the most common application is reading scattered files, such as operating system startup, opening programs, web browsing cache, etc. Each time we need to read many small files distributed in different locations on the disk. Mechanical hard drives rely on the magnetic head to constantly seek before it can read. It seeks and reads again and again, so a lot of time is spent on seeking and reading scattered small files.

The installation of Windows, Linux, or Mac operating system has been automated and foolproof for a long time, with no technical difficulty. But if you want to install and use multiple systems at the same time, whether it's a combination of multiple different versions of Windows or Windows + Linux + Mac (each has a different boot method), the hardest part is figuring out their installation order and adjusting the boot menu. This can be cumbersome and experience required even for advanced computer users.