1-15Before You Start1Optional AccessoriesNOTEBe sure to use a 3.3V SDRAM DIMM compatible with this printer as the expansion RAMmodule. It is recommended that you should use Canon Expansion RAM ER-128 orER-256 as the expansion RAM.Hard DiskYou can use a hard disk that can be built in the printer to save the received printjobs temporarily. By installing the hard disk, you can use various functions such asprint job spooling, encrypted secured print, secured print, electronic sort, and RIPOnce.IMPORTANTWhen you are using a hard disk, set MODE TIMEOUT in the SETUP menu to a settingother than OFF. It is recommended that you should specify the default setting, "15seconds".SDRAM DIMM (3.3V) compatible with this printerNotchUsableHard Disk KIT HD-93