I just picked up an IDE CD-ROM drive today, and I can
actually use it!  Many thanks to those involved (primarily
Manuel, I assume).

  I have a few questions.

  1.  At the first major access, I get "lost interrupt" messages,
    the machine basically freezes for 30 seconds to a minute,
    and DMA is turned off ("downgrading to PIO mode 3").  Is
    there a known fix for this?  The drive is a Memorex CRW-1622
    CD-RW drive, 2x writes, 6x reads.  This is on i386, of fairly
    recent -current vintage.  The autoconf says the drive
    supports DMA mode 1.  The drive is master on the secondary
    string, and my IDE disk is master on the first string.

  2.  I managed to create a multisession CD.  But how do I access
    the second session's stuff?  A mount only mounts the first
    session, and disklabel isn't faking up an entry for the second
    session.

  3.  I was thinking about accessing the second session directly
    by editing the faked disklabel, but it appears the parameters
    in the disklabel don't make sense.  It says:
      sector size of 2048
      100 sectors/track
      1 track/cyl
      (and thus 100 sectors/cyl)
      5 cyls
      total 429 sectors.

    That makes an 878KB CD-ROM, not 650MB.  And it says the first
    session took 1716 2K sectors, or ~3.4 KB, while the session
    was really just over 10 times as big.  So my idea of size
    doesn't match with the computer's.

    I tried adding a bogus /dev/cd0e, and creating that device,
    but my attempts were fruitless -- it would refuse to mount,
    presumably because the superblock didn't appear valid because
    I had my offsets wrong due to the ~10x factor mentioned
    above.

  TIA
  Brian