I pointed DW at a USB-connected external hard disk. It is a 200 GB device. I told DW to wipe it all. It seems to be doing that ... I'll add a thumbnail screenshot when it finishes.
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The tool finished in just under 2 hours. It said it wrote 25.04 GB, which is strange for a 200 GB wipe.
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According to windows explorer, there were 32 directories left on the volume. Disk Wiper generated 31, and System Volume Information caused an "access is denied" message when DW came to it. The used space/free space properties of the disk no longer are correct.
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The generated directory names were too long for the Recycle Bin. Apparently they are too long to delete at all (screenshot above). They can however be renamed.
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When renaming the folders, I eventually ran into some "files" with generated names and extensions. Properties done on the remaining directories show 64 such "files." These files could be deleted as a group.
After deleting everything, there were two folders left, System Volume Information and Recycler. Properties showed System Volume Information had no files or directories. Recycler had 66 files and 83 folders.
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The disk properties were still messed up.
