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bus speed errato?

Se dispongo di mobo e hdd che supportano ata133 perché visualizzo questo messaggio?

kernel: ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx

Ho provato da root:

hdparm -X69 -udma6 -d1 /dev/hda

ed ottengo:

 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 setting xfermode to 69 (UltraDMA mode5)
 using_dma    =  0 (off)


hdparm -i /dev/hda

 Model=Maxtor 52049H4, FwRev=DAC10SC0, SerialNo=K413JB3C
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=40020624
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-6 T13 1410D revision 0:

 * signifies the current active mode

Come mai? Come posso rimediare e impoostare il bus a 100?

Thx in advance


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