supported capacity for IDSDM microSD cards are 16 GB, 32 GB, or 64 GB, while for vFlash the capacity is 16 GB only. The write-protectswitch is built onboard on the IDSDM module.Optical drivesThe PowerEdge R640 supports one of the following internal optical drive options:• DVD-ROM• DVD+ROMTape drivesThe R640 does not support internal tape drives, however, external tape backup devices are supported.Supported external tape drives:• External RD1000 USB• External LTO-5, LTO-6, LTO-7, and 6 Gb SAS tape drives• 114X rack mount chassis with LTO-5, LTO-6, and LTO-7 6 Gb SAS tape drives• TL1000 with LTO-5, LTO-6, and LTO-7 6 Gb SAS tape drives• TL2000 with LTO-5, LTO-6, and LTO-7 6 Gb SAS tape drives• TL4000 with LTO-5, LTO-6, and LTO-7 6 Gb SAS tape drives• TL4000 with LTO-5, LTO-6, and LTO-7 8 Gb FC tape drives• ML6000 with LTO-5, LTO-6, 6 Gb SAS tape drives• ML6000 with LTO-5, LTO-6, LTO-7 8 Gb FC tape drives24 Storage