Error message: Volume "Macintosh HD is full" on brand new mini

Hi,

Just installed Logic X on a brand new Mini 2.6Ghz, 256 ss HD, 16 gigs Ram. This is a dedicated machine for music so there is really no other major programs installed. I have almost 200 gigs of free HD space. I am using 2 interfaces as an agregate device for a total of 20 i/o. One is a MOTU 896MK3 and the other is an Audiofire Echo which is the master clock. The connection is Firewire 400 and I'm recording at 44.1 to the same internal HD. I also optimized my computer settings by turning off indexing and time machine.

On this project I have about 12 tracks of live drums enabled which I can record with no problem but when I try to play the tracks back after about 30 seconds in it stops and I get this error message: Volume "Macintosh HD is full" . The session has no software instruments at this time and I have no plugins on the tracks yet. When I look at my CPU load it's very low as would be expected and I have a ton of HD space. This computer is literally 2 days old. I am monitoring the individual tracks back through the interfaces into the returns on my analog mixer channels. I should also say that I had similar issues trying to run this setup on an older macbook pro which had a lot of software installed on it and is not a robust, I thought that upgrading to a newer faster machine would be the way to go. I am suspecting that my agregate interface setup could be a week link but getting an HD error message doesn't make any sense to me. Any suggestions would be much appreciated.