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-.TH "ZEROFREE" "8" 
-.SH "NAME" 
-zerofree \(em zero free blocks from ext2, ext3 and ext4 file-systems 
-.SH "SYNOPSIS" 
-.PP 
-\fBzerofree\fR [\fB-n\fP]  [\fB-v\fP]  [\fB-f fillval\fP]  \fIfilesystem\fR 
-.SH "DESCRIPTION" 
-.PP 
-\fBzerofree\fR finds the unallocated, 
-blocks with non-zero value content in an ext2, ext3 or ext4 
-\fIfilesystem\fR (e.g. /dev/hda1) and 
-fills them with zeroes (or another octet of your choice). 
- 
- 
-.PP 
-Filling unused areas with zeroes is useful if the device on 
-which this file-system resides is a disk image. In this case, 
-depending on the type of disk image, a secondary utility may be 
-able to reduce the size of the disk image after zerofree has 
-been run.  
- 
-.PP 
-Filling unused areas may also be useful with solid-state 
-drives (SSDs). On some SSDs, filling blocks with ones (0xFF) 
-is reported to trigger Flash block erasure by the firmware, 
-possibly giving a write performance increase.  
- 
-.PP 
-The usual way to achieve the same result (zeroing the 
-unallocated blocks) is to run \fBdd\fR (1) to 
-create a file full of zeroes that takes up the entire free 
-space on the drive, and then delete this file. This has many 
-disadvantages, which zerofree alleviates:      
-.IP "   \(bu" 6 
-it is slow; 
-.IP "   \(bu" 6 
-it makes the disk image (temporarily) grow to its maximal 
-extent; 
-.IP "   \(bu" 6 
-it (temporarily) uses all free space on the disk, so other 
-concurrent write actions may fail.  
- 
-.PP 
-\fIfilesystem\fR has to be unmounted or 
-mounted read-only for \fBzerofree\fR to work. It 
-will exit with an error message if the 
-\fIfilesystem\fR is mounted writable. To 
-remount the root file-system readonly, you can first switch to 
-single user runlevel (\fBtelinit 1\fR) then use 
-\fBmount \-o remount,ro 
-\fIfilesystem\fR\fR.  
- 
-.PP 
-\fBzerofree\fR has been written to be run 
-from GNU/Linux systems installed as guest OSes inside a virtual 
-machine. In this case, it is typically run from within the guest 
-system, and a utility is then run from the host system to shrink 
-disk image (\fBVBoxManage modifyhd \-\-compact\fR, 
-provided with virtualbox, is able to do that for some disk image 
-formats).  
- 
-.PP 
-It may however be useful in other situations: for instance 
-it can be used to make it more difficult to retrieve deleted 
-data. Beware that securely deleting sensitive data is not in 
-general an easy task and usually requires writing several times 
-on the deleted blocks.  
- 
-.SH "OPTIONS" 
-.IP "\fB-n\fP         " 10 
-Perform a dry run  (do not modify the file-system); 
-.IP "\fB-v\fP         " 10 
-Be verbose; 
-.IP "\fB-f value\fP         " 10 
-Specify the octet value to fill empty blocks with (defaults to 
-0). Argument must be within the range 0 to 255. 
-.SH "SEE ALSO" 
-.PP 
-dd (1). 
-.SH "AUTHOR" 
-.PP 
-This manual page was written by Thibaut Paumard <paumard@users.sourceforge.net> for 
-the \fBDebian\fP system (but may be used by others).  Permission is 
-granted to copy, distribute and/or modify this document under 
-the terms of the GNU General Public License, Version 2 or any  
-later version published by the Free Software Foundation. 
- 
-.PP 
-On Debian systems, the complete text of the GNU General Public 
-License can be found in /usr/share/common-licenses/GPL-2. 
- 
-.\" created by instant / docbook-to-man, Mon 31 Mar 2014, 15:41