7 pass secure erase, but files are left?

after 7 pass erase shouldn't there 0 files? shows 3 folders, 2 files, 630mb used. normal? did not work right?

 

what files , folders?
can make screenshot , attach next post?

diskwiping – 1 pass enough

system files, os, nothing personal, created upon every new partition/formatted hdd make.

 

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