Prime 4 not connecting to laptops or recording

My prime 4 has stopped recording sets(music I own, not streamed), and has now stopped linking to laptops at all. It won’t read the hard drive in it even though I can see it all there on my drive on the prime 4. This has now made it impossible to record sets, or add more music to it. What is happening and how do I fix this???

What is the file system on Your hard drive? If it’s Fat32, there is a limit of the file size of 4GB. If You reached that limit with Your data base, denon can’t write more data in to it. As for computer not seeing the drive - did You tried to get the drive out of the unit and plug in to the computer directly? Maybe there are some connection issues…?