My recommendation is to get a RAMdrive
That is a hardware version, but a cheaper way is to get a software version, but with this your data is volatile meaning when you turn off your computer, you loose saved data. the reason I am suggesting this is creating sound files gives the hard drives a workout and your computer slows down because of this. create your sound file on the RAM drive and when your done copy over to hard drive.
I will post a RAM drive software as attachment, I downloaded it, but have not tried it out yet. I just hope you have the RAM to use it.
My reason for wanting it was because I have 1 GB of RAM and wanted to use it for burning CDs, this way I don’t have to worry on background processes interrupting the hard drive and wont get buffer underrun.
Does that help?