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I've deleted some old back-up files from my external hard drive into the trash, and now i can't delete them permanently. These were back-ups from the "time machine". I really don't want to buy a removal app, but i could use a little help, if possible. Thanks.

P.S. I don't know if this means anything, but when i unmounted my external hard drive, the trash container became empty. Then when i remounted the hard drive, all the trash came back.