Dell E21S001, R820 owner manual Drives, Connectors Back, Front, Internal

Memory

UDIMM	Up to 128 GB
Drives
Hard drives
Eight–hard-drive systems	Up to eight 2.5 inch, internal, hot-swappable SAS, SATA
	or Nearline SAS hard drives in hard-drive slots 0
	through 7.
Twelve–hard-drive systems	Up to eight 2.5 inch, internal, hot-swappable SAS,
	SATA, SATA SSD or Nearline SAS hard drives in hard-
	drive slots 0 through 7 (hard-drive bay 1) and up to four
	2.5 inch Dell PowerEdge Express Flash devices (PCIe
	SSDs) in hard-drive slots 0 through 3 (hard-drive bay 2).
Sixteen or eight plus eight–hard-drive systems	Up to sixteen 2.5 inch, internal, hot-swappable SAS,
	SATA, SATA SSD or Nearline SAS hard drives in hard-
	drive slots 0 through 15 or 0 through 7 and 0 through 7.
Optical drive	One optional SATA DVD-ROM drive or DVD+/-RW drive.
	NOTE: DVD devices are data only.
Connectors
Back
NIC	Four 10/100/1000 Mbps or two 10/100/1000 Mbps and two
	100 Mbps/1 Gbps/10 Gbps
Serial	One 9-pin, DTE, 16550-compatible
USB	Two 4-pin, USB 2.0-compliant
Video	One 15-pin VGA
iDRAC7	One RJ-45 10/100/1000 Mbps Ethernet
Front
USB	Two 4-pin, USB 2.0-compliant
Video	One 15-pin VGA
External vFlash card	vFlash memory card slot
	NOTE: The card slot is available for use only if the
	iDRAC7 Enterprise license is installed on your
	system.
Internal
USB	One 4-pin, USB 2.0-compliant
Internal Dual SD Module (IDSDM)	Two optional flash memory card slots with the internal SD
	module

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