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I could not figure out why no dvd backup program would work until I tried Toast 7 TITANIUM.
No other program displayed an error message.
Toast had a problem with many files and .hotfiles.btree .
The other files had been downloaded by me so I erased them one at a time each time wasting a dvd. I had told Toast to test and not to write a disc but each dvd was unusable thereafter.
Now it errs on this file that I did not download. Therefor I do not know the necessity of this file. I do not know if I may safely erase this file!
Since it only finds errors one at a time there may be many more errors and wasted discs.