I searched for this problem, I've had it before and so have others but I found nothing. What do you do when you get this error?
 
Thanks - rev

Rename or delete your aud.ini that is associated with your version of SONAR that is giving you trouble then after starting Sonar make sure the audio file path in preferences is right as it will be set to default.
 
This often fixes it and even did for me last week.

In some instances, starting/stopping the transport has allowed the file to be saved.

I just tried that but it didn't work in this case. I'd really like to know what triggers that message because it isn't true so it must be triggered by something other than a full disk.

How much spare space do you have on your hard drive? Have you run disk cleanup lately?

Tons, billions of gigs. This message is nothing to do with available space, I've had to copy the entire contents of a file to a new file in the past, such that old and new are exactly the same - message goes away on new file.
 
But I'm tired of that, I want a better solution.

This happens to me sometimes if i use an audio program before i launch sonar or if i have sonar loaded then use another player then go back to sonar..so i found if i dont open another audio program i wont get the warning..im also not using the asio driver im using the other ones wwm or mm something or other...this happened in my old cakewalk program also...deleting the aud.ini file before each load worked

Starting/stopping the transport didn't work for me and deleting the aud.ini only worked for one Save. So I can at least I can open the file but shortly afterwards I get the same message again. One of the parameters in the aud.ini must be set too low because this has never had anything to do with disk space in my experience. I'll try modifying the likely candidates one by one to see if I can isolate which parameter is triggering the message.

Sometimes I get this message too.
In our case it's up to our NAS-Server where the disc sometimes reacts too slow. This is up to a energy saving disc.
If this message appears, it's often the only way to close Sonar and restart it. Because Sonar remembers the problem and locks itself. In our case the reaction time of the disc is the problem after waking up from energy saving.

How do you fix it? You could try turning AutoSave off, that should give your disk time to wake up.
 
I still haven't found a solution for myself but I'm sure it's one of the aud.ini parameters - unless there's another file controlling how Sonar behaves. I searched the forum for other posts because this used to be a common problem but I only found my own post.