🚀 go-pugleaf

  
  First of all, Thank you for your replying to my previous question of
CD-ROM XA on TOSHIBA XM3401B. I beleive I could not be done without
your assistance.

 Let's move to main dish, I almost done a making driver and having a
chance to do Another Group (Sony/Pioneer/TEXEL) drives.  Of course, I
can access the Photo_CD by READ TOC commands (format=00b,01b) that
rmillett@netcom.com send me. But after my investgation, I came up some
questions as *BSD driver.

--- Q1. How should I use TOC with Photo_CD(Single/Multi Session)? -----

  I implements each TOC entries returned by READ TOC Format 00b
command that is General SCSI-2 as a partition.  The partition
mechanisum should be keep not only a start sector but also number of
sector. (The purpose of number of sector are checking the boundary at
reading Raw device and especially for TOSHIBA Group, a partion number
is tag for changing a SECTOR DATA FORMAT issuing by MODE SELECT under
the Multi Format)

> The starting track field specifies the starting track number for which
> the data shall be returned.  If this value is zero, the table of contents
> data shall begin with the first track on the medium.  The data is returned
> in contiguous ascending track number order.
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    So I just make a Number of block from follows calcuration.

    Number of Sector =  Start sector in Current TOC  entry -
                        Start Sector in Previous TOC entry
  
  And then READ TOC format 01b points last track number if 
Sony groups drive. I can get first sector on Last session 
from the partition table.

  But when I try to access the Single Session Photo CD that is made by
KODAK LAB. for personal, the READ TOC Entry commands returns SEVEN
entries not a ONE.  And it seems SEVEN partitions(TOC) make a one
single Session PhotoCD. This was not happen on CD-ROM "KODAK photo CD
sampler"

  +-----------+    +----------+ \
  |TOC Entry1 +--->|          |  \
  +-----------+    +----------+   \
  |TOC Entry2 +--->|          |    \
  +-----------+    +----------+     \
  |TOC Entry3 +--->|          |        Looks like all TOC Entries make
  +-----------+    +----------+     /  a single Session PhotoCD(ISO9660)
  ~           ~    ~          ~    /
  +-----------+    +----------+   /
  |TOC Entry7 +--->|          |  /
  +-----------+    +----------+ /

 Yes it's easy to just merging but if case of multi session Disk or
Mixing Data format in same disk (Allowing as CD-ROM i.e. Mode1, Mode2
form1, CD-DA ). It wii be messed up without knowing to how merege them.

> The ADR field gives the type of information encoded in the Q Sub-channel of
> the block where this TOC entry was found.
> The control field indicates the attributes of the track.

I did check them but just control field indicate type for CD-DA/CD-ROM.

       0x00 - CD-DA
       0x04 - CD-ROM

----     Q2.  Is ther any capability for Reading CD-DA data through ---------
              Sony Groups drive ? If it does, how ?

  TOSHIBA Group did by a MODE SELECT.

If you have a any idea or comment for my two question, please email me.
I will summerize as a *source code*.

Thanks in advance.

Atsushi.
-- 
Atsushi Murai                                          Email: amurai@spec.co.jp
System Planning and Engineering Co,.Ltd.               Voice: +81-33833-5341