Blockquote How is recording live TV different from …recording TV,
Well, you don’t use a computer (normally) to record TV, you’re not reading what I wrote.
Blockquote How much less does your Windows 10 PC allow your drive to sit idle? for more than 30 seconds?
I wouldn’t know, I don’t have one of them. Now, on my Mac the drive (in the old days) spun down quite frequently. Computers write in short bursts. The software (on the drive) buffers the write until enough has been accumulated to fill a sector, or until a pre-determined amount of time has passed that the software figures the writing is complete. Unless you are copying or download large amounts of data the drive spins down frequently.
DVR’s, on the other hand, are constantly writing. Video takes huge amounts of data to record just a few seconds, more than a sector can hold. As a result the drive writes almost constantly.
On a TiVo, Tablo, Homerun, etc., if you are watching Live TV (vs. recording a show you are not tuned to) the device is constantly writing and reading, storing the show you are watching, and reading the stored data to display it on your TV/Monitor). If you pause the drive doesn’t stop, it is still writing what is coming in so that when you resume the data is there for the reading, while it is still writing what is coming in. At some point decent software will also begin deleting what has been temporarily stored, which is why there is a limit on how far back you can rewind (BTW, this is where Tablo has a problem that I have complained about many times).
So, a DVR uses its drive far more heavily than a computer. The drive I had on my Tablo got so hot I could barely touch it when tech support asked me to remove it. I have since switched over to a flash drive, it still heats up, but since there is no mechanical movement it doesn’t get quite as hot.