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scanning_fixing_levels
Table of Contents
Scanning and Fixing Levels
RomVault defaults to Level 2 scanning and Level 2 fixing. These settings are best for almost all scenarios, however the options and use cases for the other levels are outlined below.
Scanning Levels
There are 3 different scanning levels which are accessed from the Scan ROMs top menu item or by right clicking a directory in the tree and using the context menu. The Scan ROMs button on the side always performs a Level 2 scan.
| Level 1 | Level 2 (DEFAULT) | Level 3 | |
|---|---|---|---|
| Description | Quick Scan | Normal Scan | Complete Rescan |
| Hashing Scope | Modified files since last scan | Modified files since last scan | All files |
| Hashing Method | ZIP: read from header 7Z (non-solid or 1 file): read from header 7Z (solid with 2+ files): decompress and hash CHD: read from header Everything else: hash files | Decompress files and hash | Decompress files and hash |
| - Size | x | x | x |
| - CRC | x | x | x |
| - MD5 | x (Non-archives only) | x | x |
| - SHA1 | x (Non-archives only) | x | x |
| Speed | Fast if files are in archives | Slow for initial scanning Fast for subsequent scans | Slow |
| Use Cases | If you haven't decided on a final place to store your ROMs yet or you just want to do a quick scan to join a torrent | Its recommended to use the default Level 2 scanning in all situations unless you have a specific reason not to | If you suspect data corruption or you previously scanned with Level 1 and want to upgrade to Level 2 by hashing MD5 and SHA1 |
| ⓘ NOTE: RomVault has built-in header skipping logic that requires checking the first few bytes of a file to see if it has a header. Solid 7z archives with two or more files require decompressing in order to check for headers. For this reason its advised not to use Level 1 scanning for 7z archives, especially large archives. If you are going to need to decompress solid 7z archives anyways, it makes more sense to stick with a Level 2 scan which will also calculate the MD5 and SHA1.  |
Fixing Levels
RomVault defaults to Level 2 fixing is which the best for almost all scenarios. The fixing level settings are controlled globally and can be accessed under Settings > RomVault Settings.
| Level 1 | Level 2 (DEFAULT) | Level 3 | |
|---|---|---|---|
| Description | Quick Fix | Normal Fix | Complete Rebuild |
| Fixing Method | Fixes ROM sets by comparing the attributes below | ||
| - Size | x | x | x |
| - CRC | x | x | x |
| - MD5 | x | x | |
| - SHA1 | x | x | |
| Raw Copy* | Yes - If CRC scanned | Yes - If SHA1 scanned | No |
| Speed | Fast | Fast | Slow |
| Use Cases | If your ROMs are also Level 1 scanned and you want to do a quick fix before joining a torrent. There is no point in using Level 1 fixing with ROMs scanned with Level 2. | Pretty much always use Level 2 fixing, especially if your ROMs are scanned with Level 2. This will ensure the highest accuracy and prevent hash collisions. | Only useful if for some reason you want to rebuild archives from scratch and completely decompress and recompress all files in the archives every time. |
Fixing Methods by Archive Type
RomVault will fix sets using different methods depending on the source and destination archive type as outlined below:
| Destination Archive Type | |||
|---|---|---|---|
| From \ To | File | TorrentZip | RV7Z |
| File | Move if needed as only instance Copy if needed as duplicate | Compress at destination | Compress at destination |
| Zip | Extract to destination | Compress at destination | Compress at destination |
| TorrentZip | Extract to destination | Raw copy (*) | Compress at destination |
| 7Z + RV7Z | Extract to destination | Extract to Cache ToSort > Compress at destination | Extract to Cache ToSort > Compress at destination |
| ⓘ NOTE: RomVault has the ability to copy raw compressed files directly from a source to a destination archive without the need for recompressing as long as the archives are in TorrentZip format. This allows for extremely fast fix operations. |
scanning_fixing_levels.txt · Last modified: 2022/02/01 14:44 by johnsanc
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