￭ Backplane support for 4 port SAS / SATA drives and 12 Gb/s Mini-SAS SFF-8087***

￭ Supports four 2.5" / 3.5" SAS/SATA HDD / SSD

￭ Includes three 80 x 15mm PWM fans

￭ Independent drive status LED

￭ Supports Micro ATX motherboards

￭ Supports four low profile PCI / PCIe slots

￭ Auto lock handle design easily secures to rackmount cabinet without screws

SPECIFICATIONS

Model No.	SST-RM21-304
Chassis form factor	2U
Motherboard	Micro ATX (9.6" x 9.6"), Mini-ITX (6.7” x 6.7”)
Drive Bay	External	3.5" or 2.5" HDD/SSD hot-swap x 4
	Internal	3.5" x 1, 2.5" x 1 (up to 15mm), slim optical x 1 (up to 12.7mm)
Cooling System	80 x 15mm ball bearing fan x 3, 4000±10%RPM
Power Supply	2U single or 2U redundant / PS2 (ATX) up to 160mm deep and 86.3mm height (not included)
Limitation of CPU cooler	68mm
Power connector on HDD backplane	4-Pin peripheral x 2
Expansion Slot	Low profile PCI / PCIe x 4
Front I/O Port	USB 2.0 x 1, USB 3.1 Gen 1 Type-A x 1**
Front buttons	Power On / Off, system reset
Indicators	Chassis :      Power LED x 1: Blue      HDD Access x 1: Green      LAN LED x 2: Green HDD Tray :      HDD Power LED x 8: Yellow      HDD Access x 8: Blinking green
HDD backplane	4 ports SAS / SATA to Mini-SAS SFF-8087 x 1
HDD Interface	SAS-1 / SAS-2 / SAS-3 SATA-1 / SATA-2 / SATA-3
Main metal thickness	1mm
Net Weight	6.3 kg
Dimension	430mm (W) x 88.5mm (H) x 480mm (D) 18.3 Liters 16.93" (W) x 3.48" (H) x 18.9" (D) 18.3 Liters

**RM21’s USB internal cable is 800mm long, so if you are connecting an external enclosure to the USB 3.1 port, we recommend using it with shorter cables to prevent performance loss. ***Mini-SAS HD (SFF8643) to Mini-SAS (SFF8087) cable and 12 Gb/s SAS HD card required for 12 Gb/s performance. (e.g. SilverStone CPS06 & ECS05)