Sega-CD: incorrect dB match: "Silpheed (USA)" is wrongly identified as "Double Switch (USA)"

[c0d3h4x0r]

This repros on RetroArch 1.19.1 (stable) for both Windows and Android. This also happens even with CRC-deduping of discs with identical serial numbers is enabled.

The checksum-verified title Silpheed (USA) is found by RetroArch's content importer, and the correct thumbnails are found for it by the online updater... but RetroArch wrongly displays the game's title in the playlist as Double Switch (USA).

Here are the actual checksums (per command-line tools) and serials (per hex editor) of the files I have. All the checksums match the redump dat file, but there's a serial number problem:

• Silpheed (USA) (Track 1).bin:

  • CRC32: BDDB8612
  • SHA1: 3bcaeabf76ae76435091325275d831f50af08521
  • MD5: 1f342e85e6fbafa98e3ddc4619c02807
  • Serial: 4419 (NOTE: the redump dat wrongly lists this one as 4423)

• Double Switch (USA):

  • CRC32: C9011B75
  • SHA1: 54898d3fcebcffede1896f51ebea2ac8f34b96ce
  • MD5: 6e2c0e2519cca290c7aa860ee56fd8c0
  • Serial: 4419 (Note: the redump dat has this one correct)

So here's what's happening:

• The two titles actually have identical serials.
• Sega-CD detection function correctly reads the Silpheed (USA) (Track 1).bin serial as 4419.
• The dB check for duplicates doesn't return any, because these two titles wrongly do not have the same serial listed in the dB.
• So the detection concludes that Silpheed (USA) (Track 1).bin must be Double Switch (USA).

[RobLoach]

Silpheed (USA) on Redump: http://redump.org/disc/17203/

May be worth getting on the forums and submitting a fix http://forum.redump.org

We'll lose this change on the next update