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'\" t
.\"     Title: dk-eradisk
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 03/28/2017
.\"    Manual: \ \&
.\"    Source: \ \&
.\"  Language: English
.\"
.TH "DK\-ERADISK" "1" "03/28/2017" "\ \&" "\ \&"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
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.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" -----------------------------------------------------------------
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.nh
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.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
dk-eradisk \- Generate patterns to erase disk before retiring it
.SH "SYNOPSIS"
.sp
\fBdk\-eradisk\fR [\fIoptions\fR]
.SH "DESCRIPTION"
.sp
The program generates a data stream to erase a disk\&. Before retiring a disk or handing a disk over to another user one should remove all contents\&. The output from dk\-eradisk can be used as input for the "dd" program to savely clean a disk\&.
.SH "OPTIONS"
.PP
\fB\-p\fR \fInumber\fR, \fB\-\-pass=\fR\fInumber\fR
.RS 4
Pass number\&. Pass 0 (should be used as final pass) can be used to write 0 bytes, so operating systems recognize the disk as new from manufacturer\&. The pass number chooses the bit pattern, one from 0x00, 0xFF, 0x0F, 0xF0, 0x33, 0xCC, 0x55, or 0xAA\&. When doing multiple passes, start with the highest pass number, use pass number 0 for the final pass\&.
.RE
.PP
\fB\-b\fR \fIsize\fR, \fB*\-\-blocksize=\fR\fIsize\fR
.RS 4
Block size (default: 4096)\&. The default is suitable for traditional hard disks\&. For flash memory (i\&.e\&. SSD) you should increase the value to 1m\&.
.RE
.PP
\fB\-c\fR \fIsize\fR, \fB\-\-count=\fR\fIsize\fR
.RS 4
Number of blocks to write\&. The default 0 creates an endless sequence of blocks until the program is finished by signal\&.
.RE
.SH "EXIT STATUS"
.sp
The program returns exit status code 0 on success, all other values indicate errors\&.
.SH "NOTES"
.sp
This program uses DK libraries version 4\&.
.SH "AUTHOR"
.sp
Dirk Krause
.SH "COPYRIGHT AND LICENSE"
.sp
Copyright (c) 2015\-2016, Dirk Krause
.sp
All rights reserved\&.
.sp
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Neither the name of the copyright holder(s) nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission\&.
.RE
.sp
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \(lqAS IS\(rq AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED\&. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE\&.
.SH "SEE ALSO"
.PP
http://dktools\&.sourceforge\&.net
.RS 4
Project homepage\&.
.RE