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Hello!<br />
<br />
Not like it's a problem so far, but mostly my curiosity. I have 2 disks -- internal and external. The latter is connected via USB3 cable. My Ubuntu install is on the external drive. W10 is inside my laptop (it's a dual-boot system). So usually my internal drive is sda and my external one is sdb in Ubuntu (they're both SATA drives, of course). But today they switched their device names, so the internal became sdb and external became sda. After the reboot everything got back to normal. I personally haven't done anything in this regard. To me that's strange. Maybe someone could explain that to me, please.
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Hello!

Not like it's a problem so far, but mostly my curiosity. I have 2 disks -- internal and external. The latter is connected via USB3 cable. My Ubuntu install is on the external drive. W10 is inside my laptop (it's a dual-boot system). So usually my internal drive is sda and my external one is sdb in Ubuntu (they're both SATA drives, of course). But today they switched their device names, so the internal became sdb and external became sda. After the reboot everything got back to normal. I personally haven't done anything in this regard. To me that's strange. Maybe someone could explain that to me, please.

Two HDDs are switching their device names in Ubuntu Linux

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).