Date: Wed, 14 Jul 2004 15:06:25 +0200 From: Jean-Sebastien Roy <js@jeannot.org> To: freebsd-hackers@freebsd.org Cc: marck@rinet.ru Subject: Re: Silent errors when reading CDs Message-ID: <40F52FD1.9040908@jeannot.org> In-Reply-To: <20040713233120.GA79064@comp.chem.msu.su> References: <40EF172C.7020508@jeannot.org> <20040713233120.GA79064@comp.chem.msu.su>
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Dmitry Morozovsky wrote: >What if you copy that big file from CD to HD twice (possibly with >unmounting/remounting in the middle) and check MD5s there? > > I tried a few times and got no error. >Testing your memory with memtest86.com's test would also be helpful to >eliminate RAM issues. > > Could get memtest86 to run for some reasons, but I tried memtest multiple times and got no error. Yar Tikhiy wrote: >Once I had an old noname PC (iP200 in an i430VX motherboard), and >I installed a DVD+RW drive into it. Data read from a CD or DVD was >damaged with high probability. With hw.ata.atapi_dma set to zero, >the probability of data corruption was lower, but still noticable. >That's while there were no corruption on burning in DMA or PIO mode. > > At least I'm not alone ! >Are there CDs in your collection that produce no errors? > > Yes, but I cannot really tell if it's by chance or they really do not produce errors. >Even a badly scratched CD won't produce damaged data unless read >in a brain-dead drive. If your drives work OK with a different ATA >controller, then it's probably your present ATA controller to blame. > > The CDs read well in other computers. FWIW, my ATA controler is an Intel ICH5 : atapci0: <Intel ICH5 ATA100 controller> port 0x24c0-0x24cf,0x280c-0x280f,0x24f0-0x24f7,0x2808-0x280b,0x24e8-0x24ef irq 10 at device 31.1 on pci0 ata0: at 0x1f0 irq 14 on atapci0 ata1: at 0x170 irq 15 on atapci0 atapci1: <Intel ICH5 SATA150 controller> port 0x24d0-0x24df,0x2814-0x2817,0x2800-0x2807,0x2810-0x2813,0x24f8-0x24ff irq 10 at device 31.2 on pci0 ata2: at 0x24f8 on atapci1 ata3: at 0x2800 on atapci1 ad0: 38166MB <WDC WD400EB-11CPF0> [77545/16/63] at ata0-master UDMA100 acd0: DVD-R <PLEXTOR DVDR PX-712A> at ata1-master UDMA33 I think I will live with this bug until I change hardware. Many thanks ! js
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