Folders ZZZZZZ

Then, we performed the MFT free space, and had to go to sleep and saw that it would take much, then canceled the process, I think that's the only reason it happened the following fact:
Today I saw that emerged folders with files called zzzzzzz, many files with that name, and not know what to do with them, I only exclude? Normally?

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If you delete them your free space wipe will have been successful (up to the data covered before the cancel). So feel free to delete them