The 3910 is basically a bunch of T3 arrays bunched together with some sort of service processor in front of them. So if you have T3's, the biggest "Sun supported" disk that you can use is 181GB disks. Using any other disks is probably not an option especially if you have to do any firmware upgrades to fix faults.
The ST3300007FC is suited for the dothill and Stotek LSI rebadged systems so I seriously doubt they would be suited for the 3910.
Stephen