"I don't really [know/understand] what's going on with that yet. Let me look into it and I’ll get back to you later today!"
Since "I Dntfs" could refer to a few different things depending on your context, I've drafted three versions based on the most likely interpretations. I Dntfs
Use this if you are trying to tell someone that you cannot write files to a hard drive because it's in NTFS format (common on Macs). "I don't really [know/understand] what's going on with