Messages in this thread |  | | Date | Tue, 3 Sep 2002 01:35:25 -0600 | From | Erik Andersen <> | Subject | Re: Linux 2.4.18: short dd read from IDE cdrom |
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On Tue Sep 03, 2002 at 04:49:12PM +0930, Jonathan Woithe wrote: > Hi all > > Yesterday I reported a problem to lkml I observed with `dd' and ide cds: > > For a number of years now I have duplicated cds using > > dd if=/dev/cdrom of=foo.iso > > cdrecord ... foo.iso > > : > > Today I tried the same trick under 2.4.18 and struck a problem: the kernel > > would not read the complete CD image. ... > > After further testing, it seems that turning off dma using "hdparm -d 0 > /dev/hdc" allows things to work as expected - the full disk can be read and > the resulting image is intact. It appears therefore that the problem may
Interesting. When DMA is enabled does running blockdev --setra 0 /dev/cdrom make any difference?
-Erik
-- Erik B. Andersen http://codepoet-consulting.com/ --This message was written using 73% post-consumer electrons-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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