Messages in this thread | | | From | Andrew Derrick Balsa <> | Subject | Re: 2.1.111: IDE DMA disabled? | Date | Sun, 26 Jul 1998 22:33:56 +0200 |
| |
Hi Alan,
On Sun, 26 Jul 1998, Alan Cox wrote: >> a) Drive quality. Quantum drives are very reliable, but this is not >> surprising since they worked with Intel to develop both DMA mode2 and >> UDMA. IBM drives are good, too. Don't know about the others. I have seen >> reports of entire batches of drives from Western Digital having >> problems, and at least one Samsung drive I tested would consistently >> malfunction under both DMA mode 2 and UDMA, even though it was specified >> as UDMA compatible. The same equipment with an IBM drive has been >> working flawlessly for a year, using UDMA. > >Ok lets approach this with more data. > >Andre - did you keep any of this data. Building a blacklist shouldnt be >that hard. It may well be overencompassing but it has to be better than >'dont do it'. Thats how you get the case where SCSI busses only run at 5Mhz.
:-) True. Just as an aside, UDMA is being pushed up to 66MB/s. The newest chipset from VIA already does this, and Intel will probably release new chipsets too. The first ATA-66 drives should appear early in 1999.
> >Currently its > > Western Digital * > Samsung [insert your drive here]
I will try to look for the exact reference. Right now I remember it was a Samsung 2.5Gb supposedly UDMA compatible hard disk drive.
It's the only drive I ever had that failed consistently. Note that it also failed under Windogs 95.
My white list is much longer, though: 1) Never had a problem with any Quantum drive, nor had any report of a problem with them. 2) Never had any problems with IBM drives either. I have had almost every single EIDE model they manufactured: 1.2Gb, 1.7Gb, 2.1Gb, 3.2Gb, 4.3Gb, 6.4Gb, 8.5Gb. All worked flawlessly in DMA mode2 and UDMA on the UDMA capable ones. 3) Late Maxtor drives reported OK, DMA mode2 and UDMA.
Chipsets: - Intel FX, VX, HX, TX: all OK from personal experience. - SiS 5597/98: OK, but must keep the PCI clock at 33 MHz. - Apollo: reports indicate it works fine. - Promise card: OK - Others: OK AFAIK
BIOSes: - Most recent BIOSes should be OK, old ones should be flashed over with new versions if available
> >Linus what drives do you have reports for, and ditto the rest of the list >(again I'll collect and summarise]
People in need of more information can check my Jumbo patch for kernel 2.0.35. It includes a large doc file /Documentation/udma.txt. Also Mark Lord probably has more data on drives that work/don't than anybody else.
Cheers, --------------------- Andrew D. Balsa andrebalsa@altern.org
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.altern.org/andrebalsa/doc/lkml-faq.html
| |