Originally Posted by JWhites
Let's not forget the SATA speed and cache also plays an important part in reading and writing data from and to the hard drive. The Premieres using SATA Rev II so it's 3 Gb/s. I'd like to think the Roamio, being brand new and completely redesigned from the ground up, is using SATA Rev III so it'd be 6 Gb/s.
The Roamio still uses SATA-I 150MB/s (1.5Gb/s) mode. The Roamios log that they set the mode to that. Apparently, that's all that is needed. I've verified with ggieseke, that this is the case with the Plus/Pro, as well (since I have all base-Roamios).
That's why it's absurd when I see people recommending 7200RPM WD Black and other high performance drives, or making claims that people should buy the SATA-III drives (there's no point).
The CPU was always the limiting factor, until the Roamio. That's what opened it up.
Unfortunately, the current 20.4.1 software has been reported to bog-down the UI and A/V, with most speculation guessing TiVo is giving the networking too many processing cycles. I've seen a few reports of people not afflicted with it.
I often wonder if people are talking about the same networking method (Ethernet, MoCA, Wireless), since most don't specify which way they are using, or if they have a base model w/100Mbit, or a Plus/Pro w/Gbit, and so on...
I'd imagine if the network being used throttles the speed due to the network backbone/method and performance limiting matters, that user may not see such issues, since their Roamios can't run at full-potential (which in theory, may reduce the load on the NIC of the TiVo). I'd think a Plus/Pro having UI and A/V lag, might speed-up if a 100Mbit switch was used to throttle the traffic. I keep suggesting people try it, when the subject comes up.
Most everything in TiVo is all on one chip, and it all has to share the processing capabilities/cycles/time.