On Thu, 2002-10-24 at 03:01, Ray Olszewski wrote: > At 05:51 PM 10/23/02 -0400, Bryan Simmons wrote: > >Perhaps dma wasn't the problem. Here's the output when I execute hdparm > >on /dev/hdc (my CD-RW): > > > >/dev/hdc: > > HDIO_GET_MULTCOUNT failed: Input/output error > > IO_support = 1 (32-bit) > > unmaskirq = 1 (on) > > using_dma = 1 (on) > > keepsettings = 0 (off) > > readonly = 0 (off) > > BLKRAGET failed: Input/output error > > HDIO_GETGEO failed: Invalid argument > > > >When I try to retrieve the read-ahead setting: hdparm -a /dev/hdc I get: > > > >/dev/hdc: > > BLKRAGET failed: Input/output error > > > >Does anyone know of a web site where I can research these errors? Or > >does anyone have an idea, off the top of their heads, why this could be > >happening? > > > I don't have a reference, but I did take a minute to get the same results > for my two drives. Both work fine. Here is what I get: > > First, for hdc, which is a DVD drive acessed via IDE -- > > waverly:/home/autovcr# hdparm /dev/hdc > > /dev/hdc: > HDIO_GET_MULTCOUNT failed: Invalid argument > IO_support = 0 (default 16-bit) > unmaskirq = 0 (off) > using_dma = 1 (on) > keepsettings = 0 (off) > readonly = 1 (on) > readahead = 8 (on) > HDIO_GETGEO failed: Invalid argument > > Now for hdd, my CD-RW drive, accessed via ide-scsi emulation -- > > waverly:/home/autovcr# hdparm /dev/hdd > > /dev/hdd: > HDIO_GET_MULTCOUNT failed: Input/output error > IO_support = 0 (default 16-bit) > unmaskirq = 0 (off) > using_dma = 1 (on) > keepsettings = 0 (off) > readonly = 0 (off) > BLKRAGET failed: Input/output error > HDIO_GETGEO failed: Invalid argument > > And just to complete the comparison, here is one of the same system's hard > disks -- > > waverly:/home/autovcr# hdparm /dev/hdb > > /dev/hdb: > multcount = 16 (on) > IO_support = 0 (default 16-bit) > unmaskirq = 0 (off) > using_dma = 1 (on) > keepsettings = 0 (off) > readonly = 0 (off) > readahead = 8 (on) > geometry = 15017/255/63, sectors = 241254720, start = 0 > > From this, I infer that the two errors I see on both removable drives > reflect differences between CD drives and hard disks. The BLKRAGET error is > somehow associated with use of scsi-ide emulation, but does not interfere > with my ordinary use of the drive. > > So ... you might, just as a test, remove the scsi-ide emulation and see if > you can then read the problem CD. If not, you can then check the readahead > setting and see if it seems to be wrong. For some reason, I can't access this setting at all. it doesn't show up when using the hdparm /dev/hdc command and when asking for it directly, hdparm -a /dev/hdc I get an input/output error.
More likely, since the problem is > specific to the one disk, there is something unusual about it that needs to > be corrected. When it is mounted, does it return sensible results in its > listings of "df" and "ls -l"? I suppose so. I can see and at least start to copy all the files on the disk. Can you "dd" it to an iso image? Is it > iso9660 compliant? I really don't know since I'm kinda ignorant to the different file-system types. I remember when first installing CD burning software in Windows (please hear me out) it told me to turn off the read-ahead on the CD-ROM to allow me to read all CD-R media. Is this relevant in Linux? > > > -- > -------------------------------------------"Never tell me the odds!"-------- > Ray Olszewski -- Han Solo > Palo Alto, California, USA [EMAIL PROTECTED] > ------------------------------------------------------------------------------- > > - > To unsubscribe from this list: send the line "unsubscribe linux-newbie" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.linux-learn.org/faqs -- Regards, Bryan Simmons =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= On Integrity: "I'm going to be as good as they let me and as mean as they make me, and they all know that. I don't ever lie. If I tell you a rooster can fly, get the harness." --Burl Cain, Louisiana State Pen Warden =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
