The only reasonI can come up with is to see both channels if you really want to compare the same channel SD vs HD.
Also I can see where it may be on BOTH when set up, so the sub can see that both formats are available on the guide, after that, most would turn the SD off I'm sure.
That is a nice feature that got added awhile back thru a CE some time ago.
I like to have both visible, so when I want to record a program that's in SD, I record it from the SD channel in order to save hard drive space on my DVR.
I like to have both visible, so when I want to record a program that's in SD, I record it from the SD channel in order to save hard drive space on my DVR.