I got a portable hard drive and ran into an issue of being afraid to move my laptop while it was running.  I also almost had it drop while giving a presentation which would have been a very bad thing as it was running 2 virtual machines at the time.  This had to be fixed ASAP. With about $4 worth of 3M removable poster mounting Velcro, I was able to mount it and remove it if I chose to.  Here are some pictures.