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Erasing GPT backup header block, if expr is good enough

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Thomas Schmitt
2020-01-07 16:47:41 +01:00
parent 43d5804db3
commit 5a335e5594
4 changed files with 123 additions and 50 deletions
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34
xorriso-dd-target/xorriso-dd-target.texi
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@ -50,7 +50,7 @@
@c man .\" First parameter, NAME, should be all caps
@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
@c man .\" other parameters are allowed: see man(7), man(1)
@c man .TH XORRISO-DD-TARGET 1 "Version 1.5.3, Jan 6, 2020"
@c man .TH XORRISO-DD-TARGET 1 "Version 1.5.3, Jan 7, 2020"
@c man .\" Please adjust this date whenever revising the manpage.
@c man .\"
@c man .\" Some roff macros, for reference:
@ -128,7 +128,7 @@ If a single plausible candidate is detected, then the program is willing to
copy a disk image file onto it. This will overwrite or make inaccessible the
previous partition table and all previous data content of the target device.
@*
@strong{Superuser power} is normally needed for filesystem type identification,
@strong{Superuser power} is often needed for filesystem type identification,
for possible unmounting, and for possible image writing.
Option @strong{-with_sudo} offers a way to gain this power only for those
tasks and to run the program elsewise with a normal user's power.
@ -275,13 +275,14 @@ sdc : NO : usb+ no_fs_while_not_su-
Option @strong{-plug_test} triggers an interactive method to unambiguously
determine the intended target device candidate. It consists of 2 or 3 steps.
@*
@strong{Step 1} is to have the intended storage device unplugged and
@strong{Step 1} is to have the intended storage device @strong{unplugged} and
to confirm this by pressing the Enter key at the program's prompt. The program
will then assess the list of not wanted devices.
@*
@strong{Step 2} is to plug in the intended storage device and to confirm this
by pressing the Enter key a second time. The program will wait up to 10 seconds
for a disk-like storage device which is not in the list of not wanted devices.
@strong{Step 2} is to @strong{plug in} the intended storage device and to
confirm this by pressing the Enter key a second time. The program will wait
up to 10 seconds for a disk-like storage device which is not in the list of
not wanted devices.
The user may wait with key pressing until the device blinking looks like it
is ready.
@*
@ -375,9 +376,18 @@ Unmounted: /dev/sde2
@*
Performing:
@*
sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sde bs=1M status=progress oflag=dsync ; sync
sudo /bin/dd if=/dev/zero of=/dev/'sde' bs=512 seek='245759999'
@*
count=1 status=none
@*
sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/'sde'
@*
bs=1M status=progress oflag=dsync ; sync
@*
... dd messages ...
@*
The first dd run shall erase a possible GPT backup header. It is performed only
if the local program "expr" can deal with the byte size of the device.
@c man .SS
@node Unwise, Reasons, Dowrite, Overview
@chapter Show commands for writing to a not advised device
@ -434,7 +444,13 @@ AGAINST THE ADVICE BY THIS PROGRAM, a daring user could do:
@*
sudo /bin/umount /dev/sdd3
@*
sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sdd bs=1M status=progress oflag=dsync ; sync
sudo /bin/dd if=/dev/zero of=/dev/'sdd' bs=512 seek='7864318'
@*
count=1 status=none
@*
sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sdd
@*
bs=1M status=progress oflag=dsync ; sync
@*
BE SMART. BE CAUTIOUS. BEWARE.
@c man .SS
@ -704,7 +720,7 @@ Thomas Schmitt <scdbackup@@gmx.net>
for libburnia-project.org
@c man .SH COPYRIGHT
@section Copyright
Copyright (c) 2019 Thomas Schmitt
Copyright (c) 2019 - 2020 Thomas Schmitt
@*
Permission is granted to distribute this text freely. It shall only be
modified in sync with the technical properties of xorriso-dd-target.