SAS Hard Drives HDD (Serial Attached SCSI) 2.5" SFF & 3.5" LFF are almost exclusively for usage in servers that use hot swappable (hot-swap) SAS HDD with a SAS hot pluggable backplane. You use a hard drive tray or caddy or sled, and simply slide and clip the drive into the front of your server.

SAS / Serial Attached SCSI hard drives are commonly used in Dell PowerEdge Servers PowerEdge R250, PowerEdge R350, PowerEdge R450, PowerEdge R550, PowerEdge R650, PowerEdge R650xs, PowerEdge R6515, PowerEdge R6525, PowerEdge R750, PowerEdge R750xa, PowerEdge R750xs, PowerEdge T350, PowerEdge T550, PowerVault ME5012, PowerVault ME5024, PowerVault ME5084 & MD3800f ; Compaq Proliant systems such as DL160 Gen8,DL320e Gen8, DL360e Gen8, DL360p Gen8, DL380e Gen8, DL380p Gen8, DL385p Gen8, ML310e Gen8, ML350e Gen8, ML350p Gen8, SL4540 Gen8, SL4545 Gen8 and Ibm xSeries such as 336, x336 and SFF (Small Form Factor) Servers & Storage Systems.