Toshiba Magnia 3310 - Manual (Page 135)

Installing and Removing Hardware
SCSI device
117
6 Install the removed rails in the SCSI device to be extended and
fix them with each two screws.
When installing a SCSI device that has two 5.25" device bays
such as a DDS autoloader, insert the device rails in the second
device bay from the top.
Installing the rails in SCSI device
Rail