In a Full installation the system files (Linux directory structure) takes up a whole drive partition.Example eg: The contents from Puppy Linux's BaseSFS are extracted to the linux directory structure. All subsequent software installations, file edits and additions are made directly to the partition's file system. The directory structure is stored as it appears in the file manager or listed by a terminal emulator. Debian Dog has a full-installer under system to install to your hard drive in a full standard install.
Frugal Install:
Frugal is a standard method for installing Linux. The Linux system files are stored in just couple of files in a directory, rather than spread out over an drive partition.
A frugal install goes onto an existing partition and can co-exist with other frugal installs, with installed Linux or installed Windows. The major benefit is you get to take advantage of the speed and size of an internal drive, up to literally ten times faster! If you are starting out with a usb-3 live-usb in a usb-3 port then the speedup will be less dramatic, but from a live-dvd then prepare to have your mind blown.
Advantages of frugal installations:
Space is saved: installation to hard drive typically is 4 times the size of the ISO, whereas with frugal it is the size of the ISO.
Frugal from hard drive is faster than from a LiveMedium.
Great for testing (once set up).
The second method is a manual install - which doesn't require the frugal installer - the instructions are from fredx181 where you want more than one dog on your HDD.
It's easy, make folders with unique names (that cannot be found on any other partitions) lets's say Dog_1 Dog_2 Dog_3, move the individual "live" folders inside, then e.g as menu.list entries (if using grub4dos) Presumes you are using a save folder rather than changes.dat file.
title Dog_1 in /Dog_1/live
uuid xxxxxxxxxxxxxxxxxxxxxx
kernel /Dog_1/live/vmlinuz1 from=/Dog_1 noauto changes=/Dog_1/live
initrd /Dog_1/live/initrd1.xz
title Dog_2 in /Dog_2/live
uuid xxxxxxxxxxxxxxxxxxxxxx
kernel /Dog_2/live/vmlinuz1 from=/Dog_2 noauto changes=/Dog_2/live
initrd /Dog_2/live/initrd1.xz
EDIT: no real need to use the installer, just mount the ISO and copy the live folder inside to your unique parent folder e.g. Dog_2
This way you can have different Debiandog installs on the same hard drive - just like how Puppy can with all your changes saved - installed frugally.
Reference to installers:
http://www.murga-linux.com/puppy/viewtopic.php?t=93391
Instructions - start here:- http://www.murga-linux.com/puppy/viewtopic.php?p=773207#773207
How to thread with more info: http://murga-linux.com/puppy/viewtopic.php?t=93496
