> I don't think you can turn off DMA on the fly anymore, only at boot time. > > Look in /etc/sysconfig/harddisks , set USE_DMA=0 Same problem - USE_DMA=0 in /etc/sysconfig/harddisks does not help the command "hdparm hdX" results in an "in-/output-error" - no output on console. How else could I check if it´s a hard- or software error?