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Block devices sda, sdb, sdc. What comes after sdz?
January 6, 2017
November 24, 2022
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The first link in the accepted answer (from 2011) is broken. Here is a new link (also from 2011) containing a good write-up: How are Linux drives named beyond drive 26?.
To summarize the main point in the link (slightly revised and reformatted):
Drive # - Name 1 - sda 26 - sdz 27 - sdaa 28 - sdab 52 - sdaz 53 - sdba 54 - sdbb 702 - sdzz 703 - sdaaa 704 - sdaab 18278 - sdzzz
Needless to say Linux is well positioned for expansion of drives.