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From: Warner Losh <imp@FreeBSD.org>
Date: Thu, 8 Jan 2009 00:45:47 +0000 (UTC)
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Subject: cvs commit: src/sys/cam/scsi scsi_cd.c
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imp         2009-01-08 00:45:47 UTC

  FreeBSD src repository

  Modified files:
    sys/cam/scsi         scsi_cd.c 
  Log:
  SVN rev 186882 on 2009-01-08 00:45:47Z by imp
  
  Make it possible to override the number of retries for the CD media.
  When trying to read scratched or damaged CDs and DVDs, the default
  mechanism is sub-optimal.  Programs like ddrescue do much better if
  you turn off retries entirely, since their algorithms are designed
  scan big areas fast, then winnow the areas down.  Turning off retries
  speeds these programs up by as much as 20x, since the drive is able to
  'stream past' many small errors...
  
  The sysctl/tunable kern.cam.cd.retry_count controls this.  That
  defaults to '4' (for a total of 5 attempts).  Setting to 0 turns off
  all retry attempts.
  
  Reviewed by:    scottl@
  
  Revision  Changes    Path
  1.104     +8 -1      src/sys/cam/scsi/scsi_cd.c