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#1
Try Space Sniffer free, it should tell you what is taking up the space.
It may be the hidden directory System Volume information, (system restore files) or the hidden Recycle Bin.
You can try to run this:
Code:vssadmin Resize ShadowStorage /For=C: /On=I: /Maxsize=320MB vssadmin Resize ShadowStorage /For=I: /On=I: /Maxsize=320MB
If that is the System Reserved, or EFI partition, that is normally hidden with no drive letter. That's normal, just ignore it. If it is one of those partitions, can't view your screen shot so can't tell, removing the drive letter will hide it again and get rid of the RED no space warning.
Thanks. That did the trick. It was a bunch of system files (probably system restore points) that seem to have dumped onto that drive when I added the Creators Update. It's weird that drive is just a partition I use to store backups of my music. It's like Windows woke up one morning and decided to start putting stuff on there.