Advertisements I just changed my cable provider, and planning for the long term. After comparing Tivo models, the choice was easy to go with the Bolt since I have a 4k UHD tv. I think this is the only one that has option besides the new EDGE, and this is mostly for planning on expected future programming. I only have one tv, its only me, but I filled up half a TB in a week. I can only guess 3TB would work, but would go bigger if there was small difference. A thousand dollars for a new DVR with 3tb and lifetime service is not in the budget for me. I may hold out hoping for a black Friday deal, but researching to feel comfortably informed and ready is priority at the moment. If I wait, its probably going to be to look for a great deal on a SSD, but that's probably not going to happen. The problem I am having in my research is this ridiculous 2.5" drive they added. I started to search for a larger 2.5" drive, and found that every drive that I saw mentioned here: WD30NPRZ - Factory 3 TB bolt HDD ( Western Digital blue label) WD40NPZZ - WD 4 TB HDD (Western Digital blue label) WD20NPVZ - WD 2 TB HDD (Western Digital blue label) ST3000LM024 - Seagate 3 TB HDD available in 1-5 TB models (Barracuda line) MQ03ABB300 - Toshiba 3 TB HDD EXCEPT the - WD10EURX - in the DVR expander - (which is available in a 2 & 3TB WD30EURX version); Are ALL mid - lower end drives (for these top companies). These drives are for your basic computer user. None of these drives mentioned are designed to be in a DVR (or surveillance) that is constantly working and recording video 24/7. Would you expect your computer's HDD to last as long as it could if you were constantly downloading, deleting, and repeat? I see weaknees says they offer a 3TB AV series HDD as an upgrade (for $300), but the blue label drive is NOT an AV series, so they are not offering the factory drive either. I don't see any reason the factory 3TB drive is special. I am thinking this is something that they know some people will just search for what came from the factory. Then think the easiest thing to do is to use that. There is nothing special about that model, or the specs from what I see. I'm thinking its just … ignorance and laziness that's kept the demand for that drive up, and therefor the $300 price. As of now, my plan is to get a: WD10JUCT - 2.5", 1 TB, WD - AV series, 9.5mm height, AV - 25 drive that is rated at 1 million MTBF (as opposed to all the previous drives listed at 600,000 that aren't designed for continuous video use), to replace the internal drive, ($47 on amazon). Then add an external; either WD82PURZ - WD 3.5" 8 TB purple (surveillance/dvr line) rated for 1.5 mil BTF. That's 2 1/2 times as long as the factory drive and actually designed for this type of use (~$220). OR, WD30EURX- 3.5" 3 TB, WD AV-GP that is the 3TB version of what came in the DVR expander ($97 Newegg). (I will not be specifically looking for the Tivo expander, only an external housing that will have the right connection). My thought is that both of these are drives that are designed for constant video recording. Both of these drives are rated at 2/3rds MORE than not only all the other drives mentioned, but also the factory drive, and they are designed for this use. (I compare this to one drive's reliability as: Well how long can one person stand there and hold a stick? I might be relying on two people, but I think I'm giving them gloves and a chair). --- DVR EXPANDER I see the WD DVR EXPANDER is the only SUPPORTED external drive. What is so special about this one? Esata connector with a "silent" hard drive? Here are the features of that drive: Advanced Format technology, GreenPower technology, IntelliPark, IntelliPower, IntelliSeek, Native Command Queuing (NCQ), Preemptive Wear Leveling (PWL), SilkStream. That hard drive is also the WD AV-GP series. What other external drives work? I know it has to. I see weakness mentioned often here, and they sell a 11 TB option that is 1 TB internal, and 10 TB external. --- Last topic, (housing modifications) just to make sure: has anyone made or tried to make a different housing to allow a 3.5" drive to fit (maybe 3d printed or made with maybe plastic, maybe carbon fiber panels, or some other material, even large enough to add a second fan)? Or just cut out enough space to make a 3.5" drive fit either in the housing or with longer cables and a separate housing, then seal around the TiVo housing. Maybe swapping the motherboard and associated parts into an older housing, (haven't looked at the motherboards if they would even fit). Again I have not yet bought anything, just doing my research first, and keeping an eye on whats for sale. If this is ridiculous for a very simple reason, please share, there's a good chance I just don't know it. Any thoughts or help would be appreciated. Thank you.