What follows is both the command line and sequence. The sequence I mention merely if its relevant as 3 years away from 80 years old command line was and is my focus challenge. The point is while data1 is present in nautilus I am still being denied due to permission. I suspect I have left something important out in the process. Please advise and thank you for you help

allen@allen-laptop:~$ sudo mkdir ~allen/data1
[sudo] password for allen:
allen@allen-laptop:~$ sudo mount -t ext3 /dev/sda4 ~allen/data1
allen@allen-laptop:~$ sudo mkdir /mnt/data1
allen@allen-laptop:~$ sudo mount -t ext3 /dev/sda4 /mnt/data1
sudo chown -R allen ~allen/data1