While Western Digital has "innovated" with its new Velociraptor, it will cease to provide it for the Mac Pro.
Indeed, as shown in photo (credit Tom's Hardware ), the connectors on the drives are not the typical locations for 3.5" products.
However, the disks-mounting tray on the Mac Pro prohibits any non-standard position.
It will certainly be possible to install the Velociraptor in place of the second superdrive, but it will not work with BootCamp and will be especially audible in the that slot.
[translation by jeremy]
