I'm going to guess that this is a multi-extent ISO, that is the file is not one contiguous piece of storage, but several. And iso-info is picking out only the first contiguous block
See https://lists.gnu.org/archive/html/libcdio-devel/2017-09/msg00000.html On Tue, Sep 29, 2020 at 2:06 PM Keith Monahan via Forum for getting help on using libcdio <[email protected]> wrote: > Hi there, > > I'm trying to associate a list of file accesses by file offsets within > an .ISO file. I need to lookup paths/filenames based on the file offset. > > The file I have is 532963328 bytes long, which would be (260326) > 2048-byte sectors. > > When I use "iso-info -l", I'm only seeing outputs from LSN's 178 to > 178993. It seems I'm almost missing around 80k sectors. > > The extra space is not padding, and the OS is definitely accessing parts > of that CDROM. I have many accesses in the 506,994,688 to 518,455,296 > range. > > If I simply multiply the LSN by 2048, should that be the file offset > within the .iso? > > I think I'm missing something fundamental here, so I appreciate the help. > > Thanks, > Keith > > >
