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My arch Linux system does not recognize neither the partition nor the hard disk in which it is installed. it is installed on /dev/sdb1 but it recognizes that as /dev/sdc1 and the initialization goes wrong. It doesn't matter which grub is used: either arch's or other distro's that is installed in another partition. When I try to initialize arch there comes /dev/sdc1 instead of /dev/sdb1. that started after I installed the fourth hd (/dev/sdd). but only with arch. I Have other distros in other partitions and there is no problem at all to initialize them. I have removed /dev/sdd for a test and solved the problem, but I need the fourth hd installed.

What can I do to solve this?

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Unless you can't (or don't want to) use persistent device naming (mentioned by @jasonwryan in his comment), you can:

  • try swapping the installed drives until you achieve the desired outcome. This however, will be tedious and error prone, plus it is likely to break the other installed OSes.

  • tell your bootloader to pass root=/dev/sdc1 to the kernel when booting Arch. That will make sure that the kernel will mount the right file system when mounting /. You may need to change this when adding/removing/moving HDDs.

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