dumpfs man page on FreeBSD

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DUMPFS(8)		  BSD System Manager's Manual		     DUMPFS(8)

     dumpfs — dump file system information

     dumpfs [-f] [-m] filesys | device

     The dumpfs utility prints out the super block and cylinder group informa‐
     tion for the file system or special device specified, unless the -f or -m
     flag is specified.	 The listing is very long and detailed.	 This command
     is useful mostly for finding out certain file system information such as
     the file system block size and minimum free space percentage.

     If -f is specified, a sorted list of all free fragments and free fragment
     ranges, as represented in cylinder group block free lists, is printed.
     If the flag is specified twice, contiguous free fragments are not col‐
     lapsed into ranges and instead printed in a simple list.  Fragment num‐
     bers may be converted to raw byte offsets by multiplying by the fragment
     size, which may be useful when recovering deleted data.

     If -m is specified, a newfs(8) command is printed that can be used to
     generate a new file system with equivalent settings.

     disktab(5), fs(5), disklabel(8), fsck(8), newfs(8), tunefs(8)

     The dumpfs utility appeared in 4.2BSD.

BSD			       January 28, 2009				   BSD

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