Product IntroductionThe M-140-JB M series of trayless storage JBOD rackmounts not only have a compact size, but the trayless and hot-swappable 3.5" bays make this chassis a new breed of storage chassis. The chassis also has a built-in 150W open-frame power supply and four peer-to-peer SATA ports on the backplane to support SAS and SATA hard drives. The M series chassis are available in 1U, 2U, 3U, and 4U form factors.1U 3.5" 4-Bay Trayless JBOD Storage Rackmount Chassis- 4 trayless hot-swappable bays for 3.5" HDDs- World's first trayless storage rackmount- Peer to peer 4x SATA ports backplane- Metal key lock for HDD front bezel- Fully RoHS compliant- Built-in 150W open-frame PSU- Centronics cut-outs to support various interface bridgeboards