Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
There is no good answer to your question, owing to the fact that NO DRV means no hard drive has been recognized in your system.
The greatest hope you have of recovering or backing up any songs stored on the device's hard drive is, to
- Turn the device Off.
- wait until it has shut down!
- unplug from the power.
- leave that way for at least 1 1/2 hours to cool down and rest/reset.
- then try it again... just see if it initializes. If it does, if the NO DRV error does not recur, I recommend backing up all data and songs etc. from the hard drive in your Roland device, at once, before it fails again.
(Replacing the hard drive may be the only option, ultimately - or, forcing a re-initialization of the current hard drive, which needless to say would erase all songs and data stored on it.)
Let me know how it goes, please, and I will try to advise you further, into the best possible outcome.