Storage

Block storage, drive letters, filesystems and disk tools: the block-device layer and its hardening, volume management, FAT32 and the VFS, the Win32 file calls, IXFS, NTFS, exFAT, ext4, Btrfs, optical discs, Apple filesystems, partition tools and disk diagnostics. The disk controllers themselves (AHCI, NVMe, VirtIO-blk, USB mass storage) are covered in Storage Controllers and Removable Media.

Roadmap Overviews

One page per storage and filesystems roadmap file, each following the page contract.

Document	Topics
Block Storage Hardening	Block-device pass-through, VirtIO-blk flush and retry, AHCI NCQ and recovery, planned SMART, counters and cache
NTFS	Read-only mounts today, the unwired write engine and journal, planned format and replay
Volume Management and Auto-mount	Boot probe order, drive-letter rules, planned hot-plug, safe removal and volume APIs
FAT32 and VFS Semantics	Strict mount checks, auto-repair, long names, share modes, locks and oplocks
Win32 File I/O	NT file calls on the VFS today, planned IRP engine, async I/O and `kernel32`
IXFS Core	Version 2 on-disk layout, `C:` mount, case folding, planned v3 inode and Windows file features
IXFS Advanced Storage	Journal, snapshots, scrub and repair pass, planned compression, dedup, encryption and quotas
exFAT	Why exFAT media do not mount, planned clean-room driver
ext4	ext magic detection, licence constraint, planned read-write driver with JBD2 replay
Btrfs	Planned read-only driver: chunk map, subvolumes, compressed extents
Optical Media	Working ATAPI layer and `cdromN` devices, planned ISO 9660, Joliet and UDF
Apple Filesystems (APFS and HFS+)	Partition type recognition, planned read-only APFS and HFS+
Partition Management and Storage Tools	Partition parsing, formatters and repair engines, planned `diskpart`, `chkdsk` and Disk Management
Disk Benchmark and I/O Diagnostics	VirtIO-blk latency histogram, planned statistics, `diskbench` and SMART health

Specifications

Reference specifications live outside the docs tree, grouped by area:

Area	Scope
Storage Controllers	AHCI, VirtIO, ATAPI and SCSI MMC, NVMe
Partitioning	GPT and MBR partition tables
Filesystems	FAT32, exFAT, NTFS, ext4, Btrfs, ISO 9660, Joliet and UDF, APFS, HFS+