Thanks for your quick reply!
I can't format the drive inside the NVR as it not appears in the "Add New" window. I can find the USB storage (pendrive) in that list but not my SATA drive. I'll give it another try today, after NTFS/FAT32 formatting prior mounting inside the NVR.
BTW, my main dislike about the EH1008H-nano NVR is the missing option of keeping (locking) some footages from being overwritten. The only option is to copy (back-up) them on the USB storage and that is time (and storage space) consuming, especially when you're in a hurry.
The other bigger dislike is the lack of custom frame rate settings on hourly basis. I need it to record at very low frame rate (3fps) during the night time (as I have some lights/trees around who's triggering the motion sensor). Another solution could have been to set a lower motion sensitivity during night time but that's unavailable, too.
Does anyone knows if there's any custom/tweaked firmware or something for this NVR?