I need to get a copy of an HDD that is a real 1:1, I mean not just the filesystem but also the geometry and the partition table and everything in between.
if I'll just use
dd if=/dev/sdb of=/tmp/file
this will generate what I'm looking for ?
Yes, this should be fine. Be sure to unmount your disk first and make sure there is enough space in the target directory.
On a root shell you can also simply do:
Alternatively, just copy it:
Please note Stephane's comment below for a potential benefit of using