HD (1080p) video @ 30fps is from 130-149MB/sec

2TB / 149MB = 13,422 minutes == 223.7 hours == 9.32 days

I'm being facetious of course but I was surprised by just how much storage space I needed to record security cameras. I have a mix of 4k & HD, and 10tb doesn't even get me a month of 24/7.

Video compression. Another separate modern marvel of mathematics.

Not sure what security cameras you’re using, but mine all use H.264 1080p compressed streams. I get about 15 days worth on a 2TB spinning rust across 6 cameras.

Even going by your own numbers, you almost certainly are using compression too. 9.32 days on 2TB does not get you a month on 10TB if you “have a mix of 4K & HD”.

Indeed. I use Unifi cams, 3x4k & 5x1080p, they use h.264. My system's current estimate is 19d 20h 37m of recording.

I really wish they enabled h265

YouTube’s 1080p is 5 megabits per second, not 130 megabytes per second.

So 2TB lasts 37 days, meaning blowski is right.

Of course powering that bodycam will be a different matter.

Of course this is all academic: the file size depends on the codec, ie how much you want to trade power for space. YT/Netflix/etc obviously trade for file size very well. But a body-worn device isn't as capable.

Take the Axon Body 2 as an example, the gold standard for police bodycams. According to its specs [0] it'll record 12 hours of 1080p video on its 64GB internal storage.

So using H.264 it produces 64gb/12hr == 5.333 (repeating of course) GB/hr, making 2TB / 5.333GB == 375 hours, or about 15.625 days

[0] https://s3-us-west-2.amazonaws.com/cms-nppgov.resources/app/...

What cameras are you using?