Human-readable file sizes in Dired+

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http://unix.stackexchange.com – I would like Dired+ to display file sizes in MB (or more generally, in a human-readable format, e.g. using KB, MB and GB when necessary). I tried the solutions described here but none of them worked. I wonder if they are for Dired and not for Dired+. I am working on GNU Emacs 23.1.1 with Dired 21.2 (which I think is the latest, although according to my dired-plus.el it was updated on: Last-Updated: Sun Nov 28 11:00:33 2010 (-0800) ;; By: dradams ;; Update #: 2816 Below I re-post the solution described in the most vote (HowTos)