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Thread: enabling dma using hdparm

  1. #1
    Junior Member registered user
    Join Date
    Aug 2005
    Posts
    22

    enabling dma using hdparm

    hi all,
    I want to enable dma for devices, but i can't. i used hdparm and it is giving the following error....
    Code:
    hdparm -d1 /dev/hdb
    
    /dev/hdb:
     setting using_dma to 1 (on)
     HDIO_SET_DMA failed: Operation not permitted
     using_dma    =  0 (off)
    plz help
    how could i enable this...
    what could be wrong
    i am using knoppix 4.02 version
    thanks in advance
    viji

  2. #2
    Senior Member registered user
    Join Date
    Jan 2007
    Posts
    104
    Try:

    sudo hdparm -d1 /deb/hdb

    The "sudo" command lets you run a command using the Superuser authority, otherwise known in Unix/Linux as the "root" user account.

    To open a terminal window with superuser authority, you can type:

    sudo su

    and you can even create a "root" account password with:

    sudo passwd

  3. #3
    Junior Member registered user
    Join Date
    Aug 2005
    Posts
    22
    i issued the command as a super user, but also the same error

    plz help

  4. #4
    Banned
    Join Date
    Feb 2005
    Location
    Sydney Australia
    Posts
    264
    are you sure ?
    why the hdb ?
    do you have a hdb ?
    most systems have an hda

    mine works with
    -d1 and
    -d 1

  5. #5
    Junior Member registered user
    Join Date
    Aug 2005
    Posts
    22
    what is there if it is hda or hdb
    my harddisk is connected as primary slave that's why hdb...

    anyway in my case its not working....

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