UNIX Desktop Questions & Answers

Among other critical Linux challenges terminal code looms large.
Got this far and think I am right. See attachment and when I open I get
Error opening file '/home/allen/data1/ Permission denied

could someone give me the chown code or anything else I lack

Code:

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/data

Thanks for your attention and help
PS not sure if relevant but in label I removed media afterattachment and only ID is data1

If my lack of caffeine doesn't misguide me:

Code:

sudo chown -R allen ~allen/data1

I had no idea I was breaking so many rules and it was not intentional. As for the chown code you supplied which I entered and am still denied permission. Please review previous post with emphasis on underlined
could someone give me the chown code or anything else I lack

Thanks again