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    Please post text as text, so that is easier to read. Commented Apr 24, 2020 at 21:46
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    sda, sdb, sbc, sdd are diskdrives (not partitions). Or at least a virtualisation of them. The number is the partition number. There is no slave or master. Hard-disks used to be called slave and master, but that was just ID 0 and ID 1 (maybe once there say something special about ID 0). Commented Apr 24, 2020 at 21:51
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    Also you may have more partitions (virtual disks) that are useful/convenient. Especially for a beginner. I am an expert, and would find it hard to find a use for so many. Commented Apr 24, 2020 at 21:53