The mini storage slot is a new slot that is present on the Cisco UCS M5 blade and rack servers. This slot can be empty, populated with an SD storage module, or populated with an M.2 SATA module.
Cisco UCS Manager does not support micro-SD card.
The mini storage SD module consists of an in-built SD controller and two SD cardslots. These cards have RAID 1 capability.
The mini M.2 SATA module consists of two SATA slots. The PCH controller present on the server controls the SATA drives on this module.
Starting with 4.0(4a), Cisco UCS Manager supports Cisco boot optimized M.2 Raid controller based off Marvell 88SE92xx PCIe to SATA 6Gb/s controller (UCS-M2-HWRAID) for mini storage.
You can use Cisco UCS Manager to inventory and manage the mini storage modules.