# 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](../../../grid/concepts/cloudunits.md).