Yes, if you have a 3rd party DVR/STB like Tivo, you will need to get a cable card and have it authorized for the device. I would verify that your DVR works with the service.
I have a HDD & DVD Player/Recorder with Digital Tuner, by Magnavox so how would I find out if it is compatible?
I suspect this device will not work on the FiOS network. As mentioned the Tivo units operate correctly using a CableCard, but I have not heard of other devices that do so. If you give us the details of the device including model number, perhaps another user here will be able to help.
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