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To squeeze the most performance out of the disk I/O subsystem, make sure
that DMA and 32-bit transfers are enabled. This can be done via the hdparm
utility, as follows (all commands are examples only):

Verify that DMA is enabled:

hdparm –d /dev/hda
If DMS is not enabled, enable it by issuing the following command:

hdparm –dl /dev/hda
Verify that 32-bit transfers are enabled:

hdparm –c /dev/hda
If 32-bit transfers are not enabled, enable them by issuing the following
command:

hdparm –cl /dev/hda

Verify the effectiveness of the options by running simple disk read tests
as follows:

hdparm –Tt /dev/hda

# posted by WebRink @ 8:03 PM