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    SubjectRe: cdrecord dev=ATA cannont scanbus as non-root

    On 2004.11.30, Jens Axboe wrote:
    > On Mon, Nov 29 2004, J.A. Magallon wrote:
    > > dev=ATAPI uses ide-scsi interface, through /dev/sgX. And:
    > >
    > > > scsibus: -1 target: -1 lun: -1
    > > > Warning: Using ATA Packet interface.
    > > > Warning: The related Linux kernel interface code seems to be unmaintained.
    > > > Warning: There is absolutely NO DMA, operations thus are slow.
    > >
    > > dev=ATA uses direct IDE burning. Try that as root. In my box, as root:
    >
    > Oh no, not this again... Please check the facts: the ATAPI method uses
    > the SG_IO ioctl, which is direct-to-device. It does _not_ go through
    > /dev/sgX, unless you actually give /dev/sgX as the device name. It has
    > nothing to do with ide-scsi. Period.
    >
    > ATA uses CDROM_SEND_PACKET. This has nothing to do with direct IDE
    > burning, it's a crippled interface from the CDROM layer that should not
    > be used for anything. scsi-linux-ata.c should be ripped from the
    > cdrecord sources, or at least cdrecord should _never_ select that
    > transport for 2.6 kernels. For 2.4 you are far better off using
    > ide-scsi.
    >
    > > The scan through ATA lasts much less than with ATAPI, and you can burn with
    > > dev=ATA:1,0,0 or dev=/dev/burner, which is the new recommended way.
    >
    > No! ATAPI is the recommended way.
    >
    > --
    > Jens Axboe
    >
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    >

    --
    J.A. Magallon <jamagallon()able!es> \ Software is like sex:
    werewolf!able!es \ It's better when it's free
    Mandrakelinux release 10.2 (Cooker) for i586
    Linux 2.6.10-rc2-jam3 (gcc 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)) #1


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