#in gentoo customly named USB disk regardless if it is sda sdb sdc ...
#add a file
/etc/udev/rules.d/01-udev-custom.rules
#containing
BUS=="scsi", KERNEL="sd*", SYSFS{model}=="L080L0", NAME="%k", SYMLINK+="usbdisk%n", RUN+="/bin/mount /disk2/ftp/USB"
#interesting command udevinfo -a -p /sys/block/sda
#for more info use writing udev rules