UDF

[Alex]

On Tuesday, Feb 24, 2004, at 00:28 Canada/Eastern, lingo wrote:

> that link to joliet solved the problem some what. it turns out that 
> the udf extension doesnt work with os9.2 and osx.  i installed the 
> joliet extension into my os9 folder and at least i can read the cds 
> now.

Actually, the Adaptec UDF Volume Access v1.5 is compatible with Mac OS 
v9.2.2 and works just fine -- but it doesn't work under OS X (including 
Classic), nor does the Joliet Volume Access extension, so using the 
latter under OS X doesn't solve anything.

These OS 9 extensions don't work under OS X because of the latter's 
radically different architecture. Think of OS X as a layered cake, with 
Darwin, Apple's open-source operating system, forming the foundation. 
Darwin consists of the XNU, the Mach-based kernel, and the BSD 
subsystem. On top of it lies the graphical subsystem, above which lies 
the application subsystem (including Classic), all covered by an icing 
of Aqua (the user interface). File system tasks are handled by the XNU 
kernel's VFS (Virtual File System), so apps (incl. Classic, with its 
extensions) in the layers above Darwin don't know anything about the 
actual file system -- they deal only with VFS.

XNU includes support for the following systems: HFS, HFS+, FAT12, 
FAT16, FAT32, NTFS (read-only), UFS, ISO9660, UDF (v1.5 only), NFS and 
SMB/CIFS; and it can be extended by means of kernel extensions (which 
are different kettle of fish from the OS 8-OS 9 extensions).

For further details, I found Amit Singh's article 
<http://www.kernelthread.com/mac/osx/> a good read.

Note that, with respect to Mavica, Apple suggests transfering the files 
directly from the camera via iPhoto (see article ID 75503).

f