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    SubjectRe: CD writing in future Linux (stirring up a hornets' nest)
    Jan Engelhardt wrote:
    >> Please explain me:
    >>
    >> - how to use /dev/hd* in order to scan an image from a scanner
    >> - how to use /dev/hd* in order to talk to a CPU device
    >> - how to use /dev/hd* in order to talk to a tape device
    >> - how to use /dev/hd* in order to talk to a printer
    >> - how to use /dev/hd* in order to talk to a jukebox
    >> - how to use /dev/hd* in order to talk to a graphical device

    > With /dev/sg, this was possible?

    Theoretically, yes, provided there was an application talking raw SCSI to
    the device in question. /dev/sg is a generic SCSI device that allows the
    sending of commands. It does not implement higher-level device models such
    as direct access (/dev/sd*), CD-ROM (/dev/sr*), sequential access
    (/dev/[n]st*) or similar. It's kind of "raw SCSI".

    OTOH, there is, according to kernel developers, no difference between
    /dev/sg and /dev/hd for SCSI command access via the SG_IO ioctl, so unless
    someone documents /dev/hd* bugs that /dev/sg* doesn't share, it appears as
    though the user space would have to live with a /dev/hd* that unifies the
    mid-level "raw SCSI command" and the high-level (block device) access.
    -
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