Can I Upgrade the Recording Capacity of My TiVo DVR?
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Roamio Series, Premiere Series, and Series3 DVRs support the use of a TiVo certified external hard drive expander. See DVR Expander FAQ for details.
There are no TiVo authorized expansion hard drives for TiVo Series2 or Series2 DT DVRs.
IMPORTANT: Removing the cover of the TiVo DVR for any reason voids the warranty. For more information, go to What is the hardware warranty?