# Storage Primitives - [ZOS Filesystem](zos_fs.md) : deduped immutable filesystem - [ZOS Mount](zmount.md) : a part of a SSD (fast disk), mounted underneath your zmachine - [Quantum Safe Filesystem](qsfs.md) : unbreakable storage system (secondary storage only) - [Zero-DB](zdb.md) : the lowest level storage primitive, is a key value stor, used underneath other storage mechanisms typically - [Zero-Disk](zdisk.md) : OEM only, virtual disk format Uses [Storage Units = SU](cloudunits.md).