Specification	DS2246	DS4246	DS4243	DS4486
Rack units	2U	4U	4U	4U
Drives per shelf enclosure	24	24	24	48
Supported Drive Types (See the Shelf and Media Technical Specifications on NetApp.com for specific drive information.)
High-capacity HDDs		√	√	√
Performance HDDs	√		√
Self-Encrypting HDDs[1]	√	√	√
Ultra-performance SSDs	√ (pure and mixed)[2]	√ (mixed only)[2]
I/O modules	Dual 6Gb/s	Dual 6Gb/s	Dual 3Gb/s	Dual 6Gb/s
Power supplies Cooling	Dual, redundant, hot-pluggable, integrated power supply and fan assemblies	Dual, redundant, hot-pluggable, integrated power supply and fan assemblies	Dual (high-capacity) or quadruple (high-performance), redundant, hot-pluggable, integrated power supply and fan assemblies	Dual, redundant, hot-pluggable, integrated power supply and fan assemblies
Drive carrier form factor	2.5" Small formfactor	3.5" Large formfactor	3.5" Large form factor	3.5" Large form factor
Drive carrier	Single drive	Single drive	Single drive	Tandem drives
Enclosure dimensions	Height: 3.4" (8.5 cm) Width: 19" (48.0 cm) Depth: 19.1" (48.4 cm) Weight: 49lb (22.2 kg)	Height: 7" (17.8 cm) Width: 19" (48.3 cm) Depth: 24" (61 cm) Weight: 110lb (49.9 kg)	Height: 7" (17.8 cm) Width: 19" (48.3 cm) Depth: 24" (61 cm) Weight: 110lb (49.9 kg)	Height: 7" (17.8 cm) Width: 19" (48.3 cm) Depth: 28" (71 cm) Weight: 160lb (72.5 kg)
MetroCluster™[3] support	√	√	√

^[1] Self-encrypting HDDs adhere to standards such as AES-128, AES-256, and FIPS 140-2.

^[2] A "pure" SSD shelf contains SSDs only; a "mixed" shelf contains a combination of SSDs and HDDs for use by Flash Pool. Flash Pool also works in "shelf-to-shelf" configurations in which SSDs from a pure SSD shelf are combined into an aggregate with HDDs from other shelves.

^[3] For details about MetroCluster, go to Maintain Availability of Vital Business Data Solution Brief PDF.