libcdio-help
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: understanding iso-info -l output


From: Rocky Bernstein
Subject: Re: understanding iso-info -l output
Date: Tue, 29 Sep 2020 14:44:40 -0400

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 <libcdio-help@gnu.org> 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



reply via email to

[Prev in Thread] Current Thread [Next in Thread]