The image in this archive is of a 24mb Shugart 4002 drive (14") from a Three Rivers PERQ 1A.
It was created using the included 'dumpdisk' utility which dumps the data over the PERQ's
RS232 port.  

The imaged drive contained working copies of POS D.61 and Accent S4, with various software
for each OS.

The image format is very simple:

  The data in the image is stored in a sector by sector basis 
  (in order of sector, track, cylinder)

  Each sector (or block) consists of:
  
  - 8 words of header (16 bytes)
  - 256 words of data (512 bytes)
  
  The 8 header words are returned from the POS IODiagRead call and according to the
  documentation these represent physical data header present on the disk, so I made sure to
  save this header information as well as the actual block data.
  
  Unreadable sectors consist of 8 words of header (which may be bogus)
  and 512 bytes of '0101010101'.  Yes, this is rather lame, but fortunately the image
  contains very few unreadable sectors.

Enjoy!
J. Dersch 8/16/2006