Guys, I looked at the link I gave you, and unfortunately it looks like someone has modified the instructions so that now they don't work. So I just did a full usb install on my laptop to check the steps, and I can give you the correct details. This was something I was going to do anyway, because I thought the instructions were a bit incomplete for beginners as it was (not referring to anyone here--just people who read the wiki), and I thought I could improve them.
Anyway, the first part of the document is correct. After downloading the .iso file, cd to the directory it is in and enter
and make a note of what the system is calling your usb device. This will be listed under the phrase "Device Boot" in the section that corresponds to the usb drive. Mine says /dev/sdb1. Here, "sdb" is the device name, and "1" is referring to the first (in this case the only) partition on the drive.
When you know the name of the drive, unmount it with
Where "X" is the letter for the drive.
Then, put the iso on your usb with
dd if=slackware-14.0-install-dvd.iso of=/dev/sdX
where again, "X" is the letter of your usb device name. Do not enter the partition number after "X" here--just the device name. For my system, I would enter
dd if=slackware-14.0-install-dvd.iso of=/dev/sdb
When finished, the drive can be used to boot your machine. Obviously you will have to tell your BIOS to boot from usb.
After it boots, go through the first part of the process where you choose your kernel, keymap, and log in as root. Then, before you run setup, you again need to find out what the system is calling your usb drive (I'm assuming you may be using a different machine now). Once again, enter
and see what is written.
Now that you know what the usb drive is called on this system, you need to mount it so it can be read. Enter
mkdir flash && mount /dev/sdX1 flash
replacing the "X" with whatever fdisk told you it is called. Here I would enter
mkdir flash && mount /dev/sdb1 flash
Note that you can actually name your mount directory anything you want; there is no specific reason to call it "flash." But that is what I am using for this example.
Now run setup (enter "setup"). Proceed with the installation. When you get to the "Source Media Selection" window, choose "Install Slackware from a hard drive partition." At the next window, where it asks for the partition where Slackware can be found, enter
or whatever you called it if you named it something else.
In the next window, which asks what directory the Slackware sources are in, enter
And that's it! You can now select your packages and finish the installation.
**Note: All this was done as root. If you are on Ubuntu and do not have a root account, you will have to enter "sudo" before pretty much every command.