RVZ Format Guide: Smaller Wii Game Archives
RVZ is a compressed disc image format created for the Dolphin emulator that stores Wii and GameCube games in a fraction of the space of a full ISO while preserving the game data losslessly, and modern managers such as TinyWiiBackupManager can convert between ISO and RVZ — including maximum-compression RVZ archives using zstd at level 19 — which makes RVZ the most practical format for archiving a large Wii library on a PC.
Where RVZ Comes From
RVZ was designed by the Dolphin project as the modern successor to its earlier WIA format. Dolphin users faced the same problem as Wii drive users: every Wii ISO is 4.7 GB even when the game uses a tenth of it. Earlier answers trimmed the padding but stored the remaining data raw. RVZ does both jobs — it discards the empty areas and compresses the real data with modern algorithms such as zstd. For many games the result is dramatic: titles that trim to 1–2 GB as WBFS can shrink considerably further as RVZ, and GameCube games (1.35 GB as a full ISO) often become a few hundred megabytes.
Because Dolphin is the reference emulator for Wii and GameCube, RVZ quickly became the standard container on the PC side of the hobby. Disc tools read it, Dolphin plays it directly, and — most relevant here — TinyWiiBackupManager adopted it as a first-class format next to ISO.
What RVZ Is Not: A Console Format
One point must be clear before anything else: USB loaders on a real Wii cannot play RVZ files. USB Loader GX and WiiFlow Lite expect .wbfs files (or ISOs) in the /wbfs/ structure. RVZ lives on the PC side of your workflow — as the archive you keep on your computer and as a format Dolphin plays natively. When a game needs to go to the Wii, you convert RVZ to WBFS, which TinyWii does in the same transfer step that copies it to the drive. Thinking of RVZ as “the archive” and WBFS as “the play copy” will keep every decision simple.
Converting With TinyWiiBackupManager
TinyWiiBackupManager (by mq1, GPL-3.0, available for Windows, Mac and Linux) supports ISO and RVZ in both directions, as documented in its GitHub README. The two conversions you will actually use are:
- ISO → RVZ for archiving. Add your ISO (for example a CleanRip dump of your own disc, or a game converted back from WBFS) and export it as RVZ. For cold storage, choose the RVZ + zstd-19 option: level 19 is the maximum zstd compression, so files are smallest at the cost of a slower, one-time conversion — exactly the right trade for an archive you rarely touch.
- RVZ → WBFS for the play drive. Point TinyWii at your USB drive and add the RVZ; it writes the standard
/wbfs/Game Name [GameID]/GameID.wbfslayout, splitting at 4 GB automatically for FAT32 drives.
TinyWii can also verify file integrity, which matters for archives: a periodic check confirms your RVZ collection still matches its stored checksums. Our TinyWiiBackupManager guide walks through the interface, and the WBM vs TinyWii comparison explains which manager suits which job — the classic Wii Backup Manager does not handle RVZ, so RVZ workflows are TinyWii (or Dolphin) territory.
RVZ vs WBFS vs ISO vs CISO
| ISO | WBFS file | CISO | RVZ | |
|---|---|---|---|---|
| Size for a typical game | Always 4.7 GB | Trimmed size | Trimmed size | Trimmed, then compressed — smallest |
| Data preserved | Everything | Game data | Game data | Game data, losslessly |
| Plays on Wii loaders | Yes | Yes | Convert first | No |
| Plays in Dolphin | Yes | Yes | Limited | Yes — native |
| Best role | Fresh dumps, verification | Play drive | Compact storage (WBM) | Long-term archive |
The pattern to notice: the formats are not rivals so much as stages. A game is dumped as ISO, archived as RVZ, and played as WBFS — and a good manager makes moving between those stages a two-click job rather than a project.
A Sensible Archiving Workflow
- Keep the play library on the Wii drive as WBFS, managed day-to-day with whichever manager you prefer.
- Keep a master archive on your PC as RVZ (zstd-19) — one folder, one file per game, named by title and GameID.
- When you add a game to the Wii drive, convert from the RVZ archive; when you remove one, the archive copy remains your safety net.
- Verify the archive occasionally with TinyWii’s integrity check, the same way you would test any backup.
Storing the Archive: Drives and Cloud
An RVZ archive of a full collection is typically tens of gigabytes rather than hundreds, which makes a two-copy strategy realistic: one copy on a large external drive, one in cloud storage, so a single disk failure cannot take the library with it.
A roomy 2.5-inch external drive is the natural home for the local copy: external hard drives on Amazon (sponsored). For the off-site copy, pCloud (sponsored) works well for a set-and-forget archive folder. These are affiliate links — see our Affiliate Disclosure. Neither is required: any drive and any cloud folder you already use will do the same job.
RVZ for GameCube Games, Too
Everything above applies to GameCube games as well, and arguably matters more there: a GameCube ISO is 1.35 GB, most games use far less, and an RVZ archive of a GameCube shelf is often a quarter of the size of the ISOs. TinyWii manages GameCube titles alongside Wii titles, and Dolphin plays GameCube RVZ files natively. On the console side nothing changes — Nintendont still expects its /games/ folder structure with an ISO image, so a GameCube RVZ is converted back to ISO when it goes to the play drive, exactly as a Wii RVZ is converted to WBFS. One archive format for both halves of the library keeps the PC side of the workflow uniform.
Frequently Asked Questions
Can I convert RVZ back to a normal ISO?
Yes. TinyWii converts RVZ to ISO, and because RVZ preserves the game data losslessly, the resulting ISO plays identically. (As with CISO, rebuilding the exact padding of a retail disc is a separate, preservation-level concern.)
Why choose zstd level 19 specifically?
It is the maximum compression level TinyWii offers for RVZ archives, and the README documents RVZ + zstd-19 as the archival path. Conversion takes longer, but you pay that cost once and save space forever.
Does Wii Backup Manager support RVZ?
No — the classic Wii Backup Manager works with ISO, CISO and WBFS. RVZ support is the clearest feature dividing the classic tool from TinyWii, and a common reason to run both.