(5) mkdir gentoo and mount the USB Hardrive
Make and then mount directories to install Gentoo. If you have a different partition schema, or used different file systems, slow down and be careful.
Is the USB Drive already mounted ?
Raspbian probably has already found your USB Hardive and mounted all the partitions on /media/. It is trying to be helpful, but it is not what we want. So we un-mount those partitions.
Lets see what Raspbian has auto mounted on /media/pi so we know what to un-mount
root@raspberrypi:/home/pi# cd /media/pi root@raspberrypi:/media/pi# ls -l total 21 drwx------ 3 pi pi 16384 Jan 1 1970 F92E-0B72 drwxr-xr-x 3 root root 4096 Apr 19 10:09 GENOOT
In my case, it has used UUID to name the swap file. GENOOT appears because I named and labelled the root partition as GENOOT when I used the gparted partition tool
umount /media/pi/F92E-0B72 umount /media/pi/GENOOT
Now we can make the mount points and mount the drives. I have a boot partition on the USB drive as a backup copy only.
mkdir /mnt/genoot mount -t ext4 /dev/sda2 /mnt/genoot
Because we are going to use the /boot partition off the SD Card, we do not make a directory and mount the /boot partition. If you have a more exotic partitioning scheme, you should make extra mount points and mount those partitions
Next : Install Base System - (Stage 3 tarball)