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Miscellaneous Forums => Scripting and Reverse Engineering => Topic started by: Bosola on 2011-03-15 00:40:42

Title: Gaps in the CDs
Post by: Bosola on 2011-03-15 00:40:42

Some of us need to insert files into unused locations on the disc. This thread documents those locations.

If you have your own, please make a suggestion, and I will create a public spreadsheet.

This thread refers to sectors rather than LBAs. For PSX discs, and other Mode 2 CD-ROMS, the sector number = the LBA + 150

Major spaces:

• The opening of the data section, sectors 150-153, are blank. This is a great place to put small inclusions.
• Sectors 341-367 are empty. That's 25 sectors, or around 50k of space.
• Sectors 17829-17839 are empty. 10 sectors, or 20k of space.
• Sectors 53921-53973 are empty. 52 sectors means over 100k of space
  
• Sectors 54052-54099 are empty. 47 sectors means nearly 100k of space
• Sectors 314,857 onwards (to 333,300 for a 74 minute ISO) are empty. 18143 sectors means around 36m of unused space

There are also some unused strings, and null data. It's also possible to insert files over unused enemy models for each disc, so long as your mod doesn't use those enemies.

I have not yet tested inclusions into all of these sections. Backup your ISOs before modifying them.

Title: Re: Gaps in the CDs
Post by: DLPB_ on 2011-03-15 00:59:04

and you tell me you wouldnt know where to begin with assembly?  Bollox.  Get reading a bit and you would easily know what you were doing :)  You have the technical mind.

Title: Re: Gaps in the CDs
Post by: Covarr on 2011-03-15 01:10:46

But empty space is far easier to find than many other things, especially if you're not sure what you're looking for.