Look in your /dev directory for /dev/sd* devices. On my system, the drive will show up, but just pop the /dev/sda1 device out there. I have to mount it manually, and it works fine from there.
Not sure about your Slackware, though, since it's been a little bit since I've touched that distro, but on Mandriva and SuSE, it works that way. Hope this helps.