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+Step: zerofree
+-----------------------------------------------------------------------------
+
+Executes `zerofree` to zero out unused space in a ext2/3/4 filesystem
+
+Step keys:
+
+* `zerofree` — REQUIRED; value is the tag for the filesystem on which to
+ zero out free space.
+
+Example (in the .vmdb file):
+
+ - zerofree: root