02-15-2012
You need to ensure that the swapped disk has at least the same, if not more, LBA's than the disk its going to mirror. Many times I have seen what appears to be the same model of disk with different LBA's.
If the disk has even one less LBA than the one being mirrored then the controller will refuse to do it (even though the disk can be physically seen by the system).
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LEARN ABOUT CENTOS
gnome-disk-image-mounter
GNOME-DISK-IMAGE-MOU(1) gnome-disk-utility GNOME-DISK-IMAGE-MOU(1)
NAME
gnome-disk-image-mounter - Attach and mount disk images
SYNOPSIS
gnome-disk-image-mounter [--writable] [URI...]
DESCRIPTION
gnome-disk-image-mounter can be used to set up disk images. Both regular files and GVfs URIs (such as smb://filer/media/file.iso) can be
used in the URI parameter. If no URIs are given and a window server is running, a graphical file chooser will be presented.
Note that gnome-disk-image-mounter will not mount filesystems or unlock encrypted volumes in the disk image - this responsibility is left
to the automounter in GNOME Shell to ensure that the same interactions happen as if the disk image was a regular physical device or disc.
By default the disk images are attached read-only, use the option --writable to change this.
RETURN VALUE
gnome-disk-image-mounter returns 0 on success and non-zero on failure.
AUTHOR
Written by David Zeuthen <zeuthen@gmail.com> with a lot of help from many others.
BUGS
Please send bug reports to either the distribution bug tracker or the upstream bug tracker at
https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-disk-utility.
SEE ALSO
gnome-shell(1), gnome-disks(1), udisks(8), losetup(8)
GNOME
March 2013 GNOME-DISK-IMAGE-MOU(1)