Permission (I Think)

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The URL is graphic view my present concern. Old partition working great sdb1
both appear on nautilus, both deliver icons to desk top. Based on the label handling of gparted results I tried following with success

sudo mkdir /media/disk/data
sudo chown allen:allen /media/disk/data

Commandline not my long suit
storage to sdb2 error msg persists error opening
/media/data_/
permission denied

Please advise what must I undo, do, to give me access

sorry for replying bcs I a not an expert in Linux but there seems to be 2 directories with almost the same name one data and one data_ (with an underscore).
In The first command you made a folder called data and then changed the ownership in the 2nd command but the error message shows the data_ folder?
Also the error indicated the folder as /media/data_ and not /media/disk/data
?!
or
May be I didnt get your question right, sorry...