Ty is correct about your OS (and file system) causing the 2GB limit. The good news is that 2GB is a lot of audio.
I’m not completely sure of your question,but if it is what audio software records in real time so when you click stop there’s a file ready to use, there are many answers. Pro Tools LE is an excellent tool, but you need an interface device between your computer and audio feed or microphones. In fact PT is often bundled with those interfaces. Check out MBox. There are a number of flavors at various prices.
You can also record with just your computer and drive using Quicktime Pro which would result in a useable file as soon as you stopped the recording. I think it costs $30.
Either solution’s files can be edited in almost any DAW.
I’m not sure what would happen if you reached 2GB and didn’t stop the recording/capture. You can limit PT. I’m not sure about QT.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
24″ TV-Logic Monitor
Final Cut Studio 2 (up to date)
Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN