Enabling the Ultra DMA on an IDE hard disk

Last update on March 18, 2009 08:32 AM by deri58
Published by deri58

Enabling the Ultra DMA on an IDE hard disk





hdparm



Principle


Under Linux, the Ultra DMA mode is not enabled by default.
hdparm is a utility included with most linux distributions, to know and, if necessary, to enable the Ultra DMA.

Getting started


If hdparm is not supplied with your distribution, and that the package does not install easily, it is always possible to install it manually: http://freshmeat.net/projects/hdparm/

Implementation

  • Knowing the information about your IDE hard disk 

hdparm -i /dev/hda


(replace hda with the drive name to be examined)

The output of this command to determine if DMA is supported and which mode can be activated (preceded by an asterisk)
  • Check if Ultra DMA is enabled 


hdparm -d /dev/hda
  • Enable Ultra DMA 


hdparm -d1 /dev/hda
  • Disable Ultra DMA 


hdparm -d0 /dev/hda
  • Monitor the performance of your disks 


hdparm -Tt /dev/hda
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