Install Slackware Using A USB Flash Drive
Installing Slackware using a USB flash drive is very easy.
Slackware includes a usbboot.img in the usb-and-pxe-installers directory of the official installation media, along with AlienBOB's usbimg2disk.sh in case the above image does not work for you out of the box.
Additionally, AlienBOB has written two articles in his blog on how to install Slackware using a USB flash drive from either
This document will describe yet another way of doing this, using Isohybrid.
Prerequisites
A USB flash drive that can fit the ISO image.
Syslinux >= 3.72
Additionally you should either have:
a) official Slackware installation media, preferably the DVD ISO one, available on any Slackware mirror
or b) a local copy of the Slackware tree.
That may be the tree of a stable release, or even the tree of the Slackware current development cycle.
If you choose to use a local copy of the tree you should be able to create your own ISO image using a script such as:
Pat's DVD script, AlienBOB's mirror-slackware-current script or even a custom one of your own.
Using isohybrid
At this point you should have a Slackware ISO lying on your hard disk.
Make it hybrid:
isohybrid slackware-13.1-install-dvd.iso
Copy the ISO to the USB flash drive
All that is left to do now is copy the ISO to the USB flash drive.
This can be done using the dd command as the root user, that will overwrite all the files currently present on the USB drive:
dd if=slackware-13.1-install-dvd.iso of=/dev/sdX
PS. dd expects the name of the device, not the partition, so you should be using eg. /dev/sdb and not /dev/sdb1.
Epilogue
Boot the machine using the USB drive. Experience should be no different than using the official installation media.