FreeBSD handbook, 16.3.2.2

[Nikolas Britton]

Quoting the FreeBSD Handbook:
"16.3.2.2 Dedicated

If you will not be sharing the new drive with another operating
system, you may use the dedicated mode. Remember this mode can confuse
Microsoft operating systems; however, no damage will be done by them.
IBM's OS/2(r) however, will "appropriate" any partition it finds which
it does not understand.

# dd if=/dev/zero of=/dev/da1 bs=1k count=1
# disklabel -Brw da1 auto
# disklabel -e da1               # create the `e' partition
# newfs -d0 /dev/da1e
# mkdir -p /1
# vi /etc/fstab               # add an entry for /dev/da1e
# mount /1
"

"# disklabel -Brw da1 auto"
what did the -r option do, why is it used in this example when
bsdlabel doesn't support it.

"# disklabel -e da1               # create the `e' partition"
Why do I have to make the 'e' partition, explain why 'e' is used and
why can't use other ones like a, c, or d? An explanation of what to do
when your editing the partition table would also be nice.

"# newfs -d0 /dev/da1e"
This command doesn't even work! and what about -O2 and -U options? if
it did work I would have made a UFS1 partition with no soft-updates.

"# mkdir -p /1"
-p? what do I need that for?