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hard disk problem

         I have a Seagate SATA hard disk 160GB.My motherboard supports till UDMA6.I have enabled UDMA 6 but hdparm -i /dev/sda command shows that the hard disk is running in UDMA 5 mode.This is what it shows.

hdparm -i /dev/sda


 Model=ST3160211AS                             , FwRev=3.AAE   , SerialNo=            5PT0G98G
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=?16?
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
 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=no WriteCache=enabled
 Drive conforms to: Unspecified:  ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6 ATA/ATAPI-7

 * signifies the current active mode

Why is it running in UDMA 5 and not in UDMA 6 mode and how can I enable UDMA 6?

Also the command hdparm -v /dev/sda shows IO_SUPPORT as 16 bit.

hdparm -v /dev/sda

 IO_support   =  0 (default 16-bit)
 readonly     =  0 (off)
 readahead    = 1024 (on)
 geometry     = 19457/255/63, sectors = 312581808, start = 0

the command hdparm -c3 /dev/sda to change IO_SUPPORT to 32 bit gives an error.

hdparm -c3 /dev/sda

 setting 32-bit IO_support flag to 3
 HDIO_SET_32BIT failed: Invalid argument
 IO_support   =  0 (default 16-bit)
How can i change the IO_SUPPORT to 32-bit???
                                                                             Thanking you

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