TempleOS is a free, public domain, open source, x86_64, non-preemptive multi-tasking, multi-cored, ring-0-only, single-address-map (identity-mapped), non-networked, PC operating system. Paging is, basically, not used.
With Solid File System OS edition your application can create a virtual disk, accessible for all or chosen applications. The disk contents can be stored in a file, in resource, memory block, database record or wherever you like.
With CallbackDisk component you can create and manage virtual disk devices within the software application that you develop and expose these disks to Windows as if they were real disk devices. The disks become visible to all processes in the system.
Control MAC functions in the Linux kernel
Linux kernel patchset
A collection of security-related features for the Linux kernel
kernel filesystem monitor daemon
Easily switch between 32-bit and 64-bit Kernel.