there are currently 3 250 gb hdds in there. i bought it with four. it's split into a lot of partitions, including a 50 gb C: drive. one of the drives is solely for music, and that won't change. what i'm going to do is combine a lot of the smaller partitions together into a larger "discography" partition that will utilize the entire 2 TB drive. this will include things like wavs for burning cds and isos for burning dvds and blu-rays, as well as all of my source material, organized in iso files. so, it's all data storage.
as i move things to the new drive, it will open up space on the old drives. so, the remaining partitions (the virtual machine partition, the temp partition, the install script partition) will be able to grow. extra temp space will be useful, but it's otherwise not going to be much of a change.