* ISO9660/HFS hybrid images
  http://en.wikipedia.org/wiki/Hybrid_disc
A hybrid disc has an ISO 9660 primary volume descriptor, which makes
it a valid ISO 9660 disc, and an Apple partition. It may also have an Apple 
partition map, although this is not necessary. The ISO 9660 portion of
the disc can co-exist with an Apple partition because the header areas
which define the contents of the disc are located in different places.
The ISO 9660 primary volume descriptor begins 32768 bytes (32KB) into
the disc. If present, an Apple partition map begins 512 bytes into the disc;
if there is no partition map, the header for an Apple HFS partition 
(known as a Master Directory Block, or MDB) begins 1,024 bytes into the disc.


* Apple Partition Map (APM) - optional
  http://en.wikipedia.org/wiki/Apple_partition_map


* HFS volume layout as logical blocks of 512 bytes each
  "Design" at http://en.wikipedia.org/wiki/Hierarchical_File_System


* HFS Volume, Boot Blocks, Master Directory Block (MDB), Catalog files
  https://developer.apple.com/legacy/mac/library/documentation/mac/Files/Files-99.html
  http://support.apple.com/kb/TA21692


* Past HFS implementations
 - hfsutils re-usability issues
   = Easy - split a public library:
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=437226
   = Hard - no support for volumes larger than 2GiB:
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=438192


* Past ISO9660/HFS hybrid images as prepared by genisoimage
  http://cdimage.debian.org/cdimage/archive/$VERSION/powerpc/