zimzam

I have 2 HDD installed in my Dahua NVR, both set to read/write and system setting to "overwrite when full" When the first HDD was full it started to record on the 2nd HDD, as expected. When the 2nd became full it started to rewrite on #2, as expected. My question is will it always record on HDD 2 from here on out? What is the best way to have it rewrite to HDD 1, then to HDD 2 or vice versa etc? To have it always record on the last full HDD seems like a waste as the first one wot be used at all. Thank You in advance