Recording storage planning · Standards-based explanation; no UK IPTV delivery implementation verified. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Start with the correct unit
Megabits per second and gigabytes of storage describe different quantities. To estimate a recording, convert bits to bytes and multiply by time. For a hypothetical constant total bitrate of 8 megabits per second, dividing by eight gives 1 megabyte per second. Over 3,600 seconds that is 3,600 megabytes, or about 3.6 decimal gigabytes. This is arithmetic for an example, not a measured UK IPTV stream.
Compare more than one plausible input
Using the same calculation, a hypothetical 4 megabit stream uses about 1.8 decimal gigabytes per hour, while 12 megabits uses about 5.4. The three examples show why one drive cannot honestly be described as holding a fixed number of hours for every source. If the actual stream varies its bitrate, the eventual file size also differs from a constant-rate estimate.
Leave usable room
The drive’s advertised capacity is not necessarily the free space available for a new file. Existing recordings, filesystem use and the particular recording implementation matter. Check the device’s model-specific storage requirements before formatting anything and protect files already on the drive. The manufacturer’s recording guidance likewise relates recording time to capacity and bitrate rather than publishing one universal hours-per-drive promise.
Measure a short sample sensibly
Make a short recording only where you have the right to do so, confirm that it plays and inspect its actual size. Use it as evidence about that source and setup, not a guarantee for every programme. Leave room for changes in duration and stream characteristics. This makes a storage discussion practical: state the model, usable free capacity, sample length and sample size instead of relying on the resolution label alone.
Questions, answered
Does a 4K label supply the bitrate for this calculation?
No. Resolution does not provide the stream’s actual total bitrate. Use measured or supplied information for the specific source, and label any planning assumption as hypothetical rather than treating 4K as a fixed file size.