Hello all, After trying a fake Extreme IV, then an Extreme III (which doesn't support UDMA) and then back onto another Extreme IV - I can finally report success! I am now using UDMA4 and enjoying speeds of 30+MB/s which is all very nice!!! (The other X41 user who reported success was also using a UDMA capable card) However, I think we can conclude that ICH6M (which on the X41, has a SATA-PATA bridge to connect a PATA drive) does not seem to support MWDMA (especially as it is not completely supported under Windows either - it is *incredibly* slow but does not give the same timeout problems as with libata), nor does libata it drop down gracefully to PIO4 when it detects these timeouts. Thanks everybody, Eddie On 05/09/07, Mark Lord <liml@xxxxxx> wrote: > Tejun Heo wrote: > > .. > > I don't think the device supports UDMA. Supported transfer modes are > > indicated in the IDENTIFY page (hdparm -I) and libata/ide would use UDMA > > if the device reports so. There's no black magic there. > > > > > > Some newer CF Cards have a funky way of reporting UDMA. > Get a copy of hdparm-7.7 (sourceforge) and try "hdparm -I" > using it, and post the output here. > > We may (or not) need to update libata to recognize UDMA on CF cards. > > Cheers > - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
