Pegasus2 M4 4TB 4-Bay Mini RAID 5/6 System featuring 2.5" HDDs with Thunderbolt 2 Technology (4 x 1TB) by Promise Technology Part# P2M4HD4US
Amazon.com: ORICO 4 Bay RAID Hard Drive Enclosure 3.5inch Type-C to SATA Aluminum External HDD/SSD Storage Drive Enclosure Screw Installtion Data Safe Protection for Enterprise Backup Up to 64TB(4x16) - WS400RC3 :
Network RAID Server Personal Cloud Storage NAS 4bay Quad Core 2GB RAM Diskless 372237881203 | eBay
Orico USB3.0 2Bay 4Bay 5Bay 3.5" Hard Drive RAID Enclosure Support Max 80TB
Amazon.com: 4 Bay RAID and JBOD Enclosure - 2.5" / 3.5 Inch Hard Drive eSATA, USB 3.0, RAID Storage System (R4U3SB) : Everything Else
G-SPEED Shuttle 4-Bay Thunderbolt 3 RAID Array - Media Storage Group
Pegasus R4 RAID Storage with Thunderbolt Connectivity for MAC OS X by Promise Technology - 4 Bay SATA 8TB (4 x 2TB) Part # PR402US
Amazon.com: ORICO 4 Bay HDD Raid Enclosure USB External Hard Drive Enclosure Aluminum Magnetic SATA III Disk Storage Case Tool-Free for 2.5/3.5 SSD HDD Support 64TB(4X16TB) for Data Backup NAS Expansion NS400RU3 :
4 Bay USB 3.0 RAID Expansion Enclosure DAS (Correct Attached Storage) Domestic Authorized Distributor
SanDisk Professional G-RAID Shuttle 4 Bay 72TB Thunderbolt 3 - SDPH34H-024T-NBAA
1U four (4) hot swap SATA bay hardware RAID0, 1, 3, 5, 10, JBOD with USB3.0 | eSATA interfaces [RM4-eSU3]