[vizeroth]

My thoughts having never owned a Mac Pro (though on my 2nd MacBook Pro): SAN/NAS + the near uselessness of internal optical drives.

In a "professional" environment, large storage is on the network, redundant, with regular backups (preferably including off-site backup). The more important the data is, the less likely anyone wants it sitting on someone's desktop any longer than necessary for that person to do their job.

The handful of people using Mac Pros in my work environment generate and store massive amounts of data, but they don't store it on their desktop indefinitely.