While messing around with the 5T OneDrive space in the Office E5 subscription, I found a file that simply couldn’t be deleted. Then, being the meddler I am, I tried the command line and a file shredder. When both failed, I brought out DG (I have BitLocker, so I didn’t want to use a PE). Even DG didn’t work, and the files kept multiplying, with all sorts of garbled files appearing. I immediately got suspicious. I ran chkdsk /f, and it asked whether to check the file system on the next restart — I said yes. Then on restart, it BSOD’d with NTFS_FILE_SYSTEM. I found out DG had directly destroyed my NTFS file system… So I had to boot into the PE and use chkdsk there. Conclusion: don’t use DG casually…