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/dev/sdaX is a physical concept: a reference to a particular hardware device and to a particular partition on that device.
In order to use, and manipulate, the data in that physical place, you must employ a file system. Specifically, you must mount that physical resource. This action gives the content of the physical resource a particular "location" in the file-system, and makes these contents available to you subject to the security restrictions imposed by that file-system.
Look into (research/study) the concepts of: filesystem, mount, &esp inode. Wikipedia is best here.
Also debugfs command (unix cmd), to learn about where pieces of files get stored on disk.
(Compare to M$Win fat32/ntfs). "How Linux Works" is a good beginner-internals book (stuff for you to know first!!!)
Boot an Ubuntu live DVD or live USB. Launch the File Manager. Use the File Manager to browse to the partition and view/delete your files. Exactly the same as File Explorer in Windows.
Boot an Ubuntu live DVD or live USB. Launch the File Manager. Use the File Manager to browse to the partition and view/delete your files. Exactly the same as File Explorer in Windows.
But be aware that, if a File Manager can do this, it is being "very smart and clever" to, in effect, hide the details from you. Direct access to the content of a partition must occur through a filesystem mount, which of course implements the "files and directories" that you perceive to be there.
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