There's an unknown space that is used on my hard drive. I've already use DaisyDisk and OmniDiskSweeper but both haven't detected anything.

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  • What do you mean with "unknown space"? The 852.1 MB? Some disk space is allocated to the file system itself! On a virgin 64 GB HFS+ volume about 157 MB are occupied by it.
    – klanomath
    Jul 22 '17 at 6:27
  • how can i delete it?
    – blaogeez
    Jul 22 '17 at 6:46
  • Please ask questions in your "question" but not in the comments...
    – klanomath
    Jul 22 '17 at 10:51

If you don't have any data on the drive, then format it. The data is probably a malfunctioning HFS+ journal.

If you do, it is either a HFS+ journal, or some cached data. It could also be the .Trashes folder. If it is, try clearing the trash with the drive plugged in, or just type sudo rm -rf "/Volumes/DriveName/.Trashes".

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