If your Frontier provided DVR, Motorola QIP 7216 for instance, seems to have less and less recording capacity over time. You may be able to regain some of it's original capacity by unplugging the power cord for about 15 seconds. Then reconnecting.
I do this periodically to recover space. This evening for example the used space went from 77 percent all the way down to 47 percent. YMMV.--
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