Messages in this thread | | | Date | Tue, 30 Nov 2004 08:16:39 +0100 | From | Jens Axboe <> | Subject | Re: cdrecord dev=ATA cannont scanbus as non-root |
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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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