On Thursday 18 February 2010 14:33:38 James wrote:
> Hello,
> 
> 
> hdparm -i /dev/hda
> 
> Model=IBM-DJNA-371350, FwRev=J76OA30K, SerialNo=GM0GMGB6505
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=34
>  BuffType=DualPortCache, BuffSize=1966kB, MaxMultSect=16, MultSect=16
>  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=26520480
>  IORDY=on/off, tPIO={min:240,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
>  AdvancedPM=no WriteCache=enabled
>  Drive conforms to: ATA/ATAPI-4 T13 1153D revision 17:  ATA/ATAPI-1,2,3,4
> 
>  * signifies the current active mode
> 
> 
> Should I put the drive into udma4 mode?
> 
> If so, wouldn't I use:
> 
> hdparm -d 1 -X 68  /dev/hda


According to the hitachi manual (who made this drive for IBM) the DJNA-3XXXXX 
series has a Ultra ATA Mode 2 (33.3 MB per second) capability.  So the kernel 
is not lying in this case and you can trust hdparm in what it shows.  I 
suggest you leave alone.
-- 
Regards,
Mick