cd-rom data block read

What is the command to read blocks of data off a cd-rom?  I cannot find any such command in the Apple DV22 (CD-ROM driver calls) manual.  You can read blocks of audio in using the READAUDIO (csParam=115).  Does anyone know what to set csParam equal to in order to get data instead of audio??
meyerklAsked:
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Paul BCommented:
Hi,
  if you want to read data from a CD then issue a PBRead with
        PBlock.ioVRefNum = drive number of CD;
        PBlock.ioRefNum =   driver refnum ;
        PBlock.ioCompletion = nil;
        PBlock.ioBuffer = buffer;
        PBlock.ioPosMode = 1;
        PBlock.ioReqCount = 512 * number of blocks;
        PBlock.ioPosOffset = 0;
         
     Paul B
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meyerklAuthor Commented:
i notice you used 512 to multiply the number of blocks.  If i increase the block size to say 1024, would i just change that to be 1024 times the number of blocks.
also, the PBRead call as i understand it, will read in the current block.  how would i reposition the pickup to read in separate blocks??

thanks
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