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5333 private links
tr '\0' '\377' < /dev/zero > /mnt/a/1
It will abort with an error when the drive is full.
See https://ss64.com/bash/tr.html for syntax/usage of "translate" ("tr").
translate every occurrence of '0' in /dev/zero to char 255 (377 octal) and send output to file named "1" in directory /mnt/a/