The DVD ROM drive and front USB board are mounted in a removable module that is accessed from the system’s front panel. The DVD/USB module must be removed from the hard drive cage in order to service the hard drive backplane.
Figure 89 DVD/USB Module in a Sun SPARC Enterprise T5120 Server
The Hard Drive backplane supports either a SATA DVD or a PATA DVD, depending on when it was manufactured. Servers that contain a SATA-compatible backplane have a "SATA" label on the front bezel. Servers with the older PATA-compatible backplanes do not have any DVD label on the bezel.
Note - SATA-compatible backplanes have special keying that prevents full insertion of a PATA DVD. When installing a PATA-type DVD, do not force the module if it resists full insertion. It may be that the backplane is not PATA-compatible.