FormFactor Type Speed RotationalSpeed CapacitiesSAS 12 Gb 15 K 300 GB, 600 GB, 900 GB, 900 GB—SED FIPS3.5 inches SATA 6 Gb 7.2 K 1 TB, 2 TB, 4 TB, 8 TB, 10 TBSAS 12 Gb 7.2 K 1 TB, 2 TB, 4 TB, 8 TB, 10 TB, 4 TB (SED FIPS), 8 TB—SED FIPSTable 11. Supported drives - NVMe SSDNVMe SSD drives description800 GB 2.5-inch Device1.6 TB 2.5-inch Device3.2 TB 2.5-inch DeviceKIT, CRD, NVM, 1.6, HHHL, PM1725KIT, CRD, CTL, NVME, PM1725KIT, CRD, NVM, 3.2, HHHL, PM1725External storagePowerEdge R640 supports the external storage device types listed in the table below.Table 12. External storageDevice Type DescriptionExternalTapeSupports connection to external USB tape productsNAS/IDMapplianceSoftware Supports NAS software stackJBOD Supports connection to 12 Gb MD‐series JBODsTopics:• IDSDM/vFlash card• Optical drives• Tape drivesIDSDM/vFlash cardIn the PowerEdge R640 system, the IDSDM module contains the Internal Dual SD Module (IDSDM) and vFlash card that are combined intoa single card module. There are two SKUs available for PowerEdge R640:• vflash• vflash + IDSDMThe IDSDM with vFlash module has a dedicated slot at the back of the system chassis. This is a Dell EMC-proprietary PCIe x1 slot thatuses a USB 3.0 interface to host. In the PowerEdge R640 systems, the IDSDM and vFlash card size changes from SD to microSD and theStorage 23