On Mon, 29 Nov 2004, Wolfgang Solfrank wrote:

>> Now, ISO 9660 (level 3) does have a mechanism for larger files, but it's
>> not widely supported.  Simply put, consecutive directory entries with the
>> same name are to be taken for "file sections" of the same file. I recently
>> posted a patch to the cdrecord list to do the level 3 thing. Unfortunately,
>> NetBSD can't read such a file system correctly, ...
>
> Well, I once was thinking about support for this in NetBSD's cd9660, but
> discovered that the there is no easy support for this, as the "file sections"
> can be of arbitrary lengths, e.g. the first 3 sections could be 3 bytes each.
> Which means that you cannot easily convert a file offset to a block number
> and vice versa.  However, the fs independent code in NetBSD assumes in various
> places that it _can_ do this conversion without the help of fs dependent 
> code.

I would think it would be much like appending a file, where the 
subsequent bits may end up in a different cylinder group, but I don't 
know my way around the file system code. [The level 3 file sections 
can be anywhere on the disk, but they must be listed in order in the 
directory, consecutively, and all but the first has the 
"multi-section" bit set, all to make it practical for an 
implementation to assemble a file from them, no doubt.]


Frederick