www.wdc.com/quality/err-rec.html
There are firmware releases that do not handle UDMA correctly.
Until a better test can be composed that tests against model and firmware,
safety first is the rules of the game.
If your drive functions okay, then edit the ./drivers/block/ide-dma.c
file.
On Thu, 21 Jan 1999, David Whysong wrote:
> On Thu, 21 Jan 1999, Koby Kahane wrote:
>
> >I have recently upgraded from 2.0.36 to 2.2.0-pre9
> >
> >I've noticed that my boot messages say that DMA is disabled for my
> >2nd and 3rd hard disks. Is it safe for me to enable DMA (via hdparm)
> >for these drive models or should I stick to none-DMA mode?
>
> I don't know about the AC33100H, but my AC31600H has worked perfectly with
> DMA for about 3 years. I don't know why it has been blacklisted...
>
> [root@Sleepy dwhysong]# grep '/dev/hdb' /etc/rc.d/rc.local
> hdparm -m16 -u1 -c1 -d1 /dev/hdb
>
> [root@Sleepy dwhysong]# hdparm -i /dev/hdb
>
> /dev/hdb:
>
> Model=WDC AC31600H, FwRev=23.16U73, SerialNo=WD-WT289
> Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
> RawCHS=3148/16/63, TrkSize=57600, SectSize=600, ECCbytes=22
> BuffType=3(DualPortCache), BuffSize=128kB, MaxMultSect=16, MultSect=16
> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow)
> (maybe): CurCHS=787/64/63, CurSects=3173184, LBA=yes, LBAsects=3173184
> tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
> IORDY=on/off, tPIO={min:160,w/IORDY:120}, PIO modes: mode3 mode4
>
> [root@Sleepy dwhysong]# hdparm /dev/hdb
>
> /dev/hdb:
> multcount = 16 (on)
> I/O support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 787/64/63, sectors = 3173184, start = 0
>
>
> Dave
>
> David Whysong dwhysong@physics.ucsb.edu
> Astrophysics graduate student University of California, Santa Barbara
> PGP public keys available at http://www.physics.ucsb.edu/~dwhysong/pgpkey.asc
> DSS PGP Key 0x903F5BD6 : FE78 91FE 4508 106F 7C88 1706 B792 6995 903F 5BD6
> D-H PGP key 0x5DAB0F91 : BC33 0F36 FCCD E72C 441F 663A 72ED 7FB7 5DAB 0F91
>
>
> -
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Cheers,
Andre Hedrick
The (NEW) Linux IDE guy
The APC UPS Specialist for Linux
http://www.dyer.vanderbilt.edu/server/udma/
http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.5.2.bin.tar.gz
You just need a bigger hammer, or learn how to swing the one you have better.
(C) me.....
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