On Fri, 23 Jul 2004, Marc Haber wrote: > On Fri, Jul 23, 2004 at 11:55:54AM -0400, Alan Stern wrote: > > Yes, and the subsequent errors looked exactly the same. It's very > > consistent. Apparently your drive doesn't like to transfer data from > > sector 18743651. (I got that number by taking the start sector address > > 0x011e0120 from the second line in the log and adding 0x43 = 34304/512, > > the number of sectors successfully transferred when the error occurred. > > Subsequent attempts encountered the same error at the same sector number. > > This is just beyond the 9 GB mark.) Instead it's sending an invalid > > signal on the USB bus. > > It's a different sector number every time, and this is the third drive > that I have tried in that enclosure (the first two being rather recent > models made by Seagate, the one that you have seen the log from an > older IBM DTTA from 1999).
Do you mean that it's a different sector number every time you run your test, or a different sector number every time you put a different disk in the enclosure, or something else? In the log you sent there were multiple errors and they _all_ referred to the _same_ sector. > > It's not clear whether the real source of the error is in the drive or in > > the enclosure. > > I am pretty sure it's not the drive (I have tried three), but can the > USB adapter in the system be a problem as well? It's possible. The USB adapter just might be sensitive to certain patterns of data, and the sector in question might contain one of the bad patterns. There was a discussion a few months ago from someone who found that his USB-IDE adapter would fail every time he tried to transfer sectors containing a certain pattern of 3 or 4 bytes right at the sector boundary. See these email threads: http://marc.theaimsgroup.com/?l=linux-usb-devel&m=107962180123336&w=2 and http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108045000409630&w=2 I think in his case there was a hardware problem with the adapter. Maybe this is happening to you too. > > One thing you could try is to reduce max_sectors to 128. > > How can I do that? See http://www.linux-usb.org/FAQ.html#i5 Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_id=4721&alloc_id=10040&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
