/title/00000001/00000002/data/cache.dat

The cache.dat file holds certain data from the last run disc on the Wii to speed up running it again.

It caches:

• Drive info (?) 0x20 bytes

0000000: 0000 0002 2007 0213 4100 0000 0000 0000  .... ...A.......
0000010: 0000 0000 0000 0000 0000 0000 0000 0000  ................

• Disk ID (and magic) 0x20 bytes

0000020: 3435 3845 3031 0000 0000 0000 0000 0000  458E01..........
0000030: 0000 0000 0000 0000 5d1c 9ea3 0000 0000  ........].......

• "Game TOC" 0x20 bytes -- number of partitions, offset to partition map

0000040: 0000 0002 0001 0008 0000 0000 0000 0000  ................
0000050: 0000 0000 0000 0000 0000 0000 0000 0000  ................

• "Partition info" (variable, padded to 0x20 bytes?)

0000060: 0001 4000 0000 0001 03e0 0000 0000 0000  ..@.............
0000070: 0000 0000 0000 0000 0000 0000 0000 0000  ................

The rest of the offsets may be shifted based on the size of the partition info.

• "Boot info 3" (?) 0x2000 bytes -- region age limits, magic?

0000080: 0000 0001 0000 0000 0000 0000 0000 0000  ................
0000090: 8003 8080 8080 8080 8080 8080 8080 8080  ................
00000a0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
*
0002070: 0000 0000 0000 0000 0000 0000 c3f8 1a8e  ................

• Disc TMD, 0x4A00 bytes

0002080: 0001 0001 abe0 7836 4d1e 991f 3672 3e78  ......x6M...6r>x
0002090: 703a b607 0136 8248 769f d033 479e 9b6a  p:...6.Hv..3G..j
[...]

• "Apploader header" 0x20 bytes

0006a80: 3230 3038 2f30 322f 3239 0000 0000 0000  2008/02/29......
0006a90: 8120 0294 0000 1b3c 0003 9ca0 0000 0000  . .....<........

• Apploader (variable)
• "Apploader load" (? -- presumably the DOL)
  • Header?

00085e0: 0000 f740 0005 cb40 0000 0020 0000 0020  ...@...@... ... 
00085f0: 803f ff80 0005 e000 3fd9 1ff8 0000 0000  .?......?.......
0008600: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0008610: 0000 0000 0000 0000 0000 0000 0000 0001  ................
0008620: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0008630: 0000 0000 0000 0000 0000 0000 0000 0001  ................
0008640: 0000 0001 0000 0005 0000 0000 0400 0000  ................

• • DOL

000a620: 0000 0100 0000 25e0 0000 0000 0000 0000  ......%.........
000a630: 0000 0000 0000 0000 0000 0000 000f 2360  ..............#`
000a640: 000f 2720 000f 2ce0 000f 2d00 000f 2d20  ..' ..,...-...- 
[...]

• FST?
• Banner (variable)

The rest of the data in the cache file is garbage; the filesize is always 11534336 bytes, and old data will stay in the cache until it is overwritten.