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File Analysis

Dreamcast VMU Filesystem Consistency Auditor

Confirm the fixed root, FAT, directory-chain and directory-entry predicates already required by the strict VMU parser.

Dreamcast

01 / Tool workbench

Use the runtime only when it is actually ready.

The application shell fails closed. An input interface is not enabled merely because a WordPress Tool record exists; the declared engine must be registered in the current build.

Dreamcast VMU Filesystem Consistency Auditor
BROWSER LOCAL

Checking whether the declared runtime module is loaded. No input has been processed.

Session change summary

No output has been built in this session.

Read-only Phase 66 boundary

This Tool exposes one distinct Dreamcast VMU/DCM/VMI structural diagnostic. It never repairs, extracts, migrates, converts, rewrites allocation, synthesizes metadata, or edits game-specific save fields.

Trust boundary

Exact representation geometry and the existing strict internal parser must validate. Raw Genesis/Saturn/N64/SNES/GBA SRAM-like files are not promoted from extension or size alone.

Dreamcast VMU Filesystem Consistency Auditor

Confirm the fixed root, FAT, directory-chain and directory-entry predicates already required by the strict VMU parser.

02 / Compatibility

Know the supported input before opening a file.

Compatibility fields are intentionally explicit. Missing values stay unclaimed rather than being filled with generic assumptions.

Accepted extensions

.vmu.vmd.bin.raw

Platforms

Dreamcast

Supported versions / editions

Dreamcast VMU/VMS flash images, Nexus DCM full-flash dumps, and VMI metadata records as applicable to the selected profile.

Input constraints

Exactly 131,072 bytes; strict VMU root/FAT/directory predicates must validate.

Known limitations

Read-only structural intelligence only. No CRC repair, FAT/directory reconstruction, file extraction, payload editing, allocation mutation, migration, conversion, signing, or raw-SRAM size-only promotion.

Output / result

A deterministic browser-local JSON report bound to the selected source by SHA-256; no raw game payload bytes are embedded beyond bounded metadata fields.

03 / Instructions

Use a reversible workflow.

File-oriented workflows start with an untouched original. Tool-specific instructions add only details documented for this utility.

  1. 01Keep the original

    Preserve an untouched copy before creating or transforming binary output.

  2. 02Confirm scope

    Match the file size, format, platform, and version to the support information on this page.

  3. 03Process locally

    Use the runtime only when the page reports that its declared engine is loaded.

  4. 04Validate output

    Compare or test the result before replacing any working source file.

Tool-specific steps

Choose one local Dreamcast VMU/DCM/VMI file. SaveEditor validates the documented representation before producing a read-only structural report; ambiguous raw cartridge save geometry is never promoted by extension or size alone.

04 / Privacy and processing

The processing mode is part of the product contract.

SaveEditor.com should state local processing only when the implementation truly keeps file contents in the browser. Server or hybrid processing must be disclosed just as clearly.

Declared mode

Browser local

Runtime state

Operational

Tool-specific privacy notes

Phase 66 processes only the selected local file in the browser under the permanent 16 MiB ceiling. No selected save bytes are uploaded by the sega-retro-ecosystem-v2 runtime.

05 / Troubleshooting

When a file is rejected, do not force it.

A rejection can indicate an unsupported size, format, version, platform, or byte sequence. Preserve the original and correct the input instead of bypassing validation.

Wrong file or size

Re-check the documented input type and browser size limit before retrying.

Unsupported format

A generic converter does not imply support for every game-specific container, signing scheme, or serialization format.

Source was modified

Return to the untouched source instead of repeatedly processing a damaged or partially transformed file.

Known Tool issues

A refusal means the selected bytes did not satisfy the strict Dreamcast VMU/DCM/VMI predicates required by this profile. Renaming a file or matching a common SRAM size does not bypass validation.

06 / Verification

Support claims should be traceable.

The verification date, method notes, and public references are kept separate from marketing language so compatibility can be reviewed over time.

Last verified2026-08-11
Profiledreamcast-vmu-filesystem-consistency-auditor

Method notes

Verified against the existing strict VMU/DCM/VMI parsers, deterministic fixtures, malformed/truncated negative cases, SHA-256-bound reports, source immutability, independent reference reconstruction and full historical source/installable parity.

Public references

  1. https://mc.pp.se/dc/vms/flashmem.html
  2. https://mc.pp.se/dc/vms/vmi.html

07 / FAQ

Questions to answer before editing.

These answers are generated from the Tool record and current runtime state rather than generic compatibility promises.

Is Dreamcast VMU Filesystem Consistency Auditor ready to use?
The Tool record is verified and declares an operational runtime. The page enables its input controls only when the declared engine module is loaded in the current build.
Does processing stay in the browser?
Yes for this declared mode. The loaded runtime processes the explicit input in the browser; Tool-specific privacy notes describe the exact scope and limits.
Should I keep the original file?
Yes. Keep an untouched source file until any generated output has been validated.
What if my input is rejected?
Use the validation message to correct the base, encoding, width, timezone, byte alignment, or size. The runtime does not guess through invalid input.

Related guides

Read the guidance connected to this tool.

Only reviewed, index-ready Guides that explicitly reference this Tool are included.