Messages in this thread | | | Date | Wed, 22 Nov 2006 11:53:22 +0100 | From | DervishD <> | Subject | usb-storage data errors |
| |
Hi all :)
I'm having a problem with usb-storage devices under:
- Two different kernels: 2.4.31 (vanilla) and 2.6.17 (Ubuntu). - Two different USB 2.0 cards (ALi chipset and VIA chipset). - So, two different drivers (OHCI and EHCI). - Two different usb-storage adapters (an external USB box from an unknown manufacturer and Conceptronic CIDE23U). Both are USB-to-IDE adapters. - Many different hard disks. - Both vfat and ext2/3 filesystems. - Perfect RAM (at least, that's what memtest says). - Correctly cooled system.
The problem is the following: whenever I copy a lot of data to the usb-storage device (more than a few GB's), the copy goes OK, without an error, but when I compare the copied files with the original files, sometimes a copied file is different. This does not happen if I copy the files one by one, and it doesn't happens all the time, sometimes the copy is perfect.
In addition to this, from time to time the usb-storage adapters (any of them, with any of the USB cards and any kernel) report a read error, telling that some sector could not be read. This is false because if I repeat the operation, the sector is correctly retrieved. This can be related to some kind of timing problem, I don't know.
The fact is that I cannot reproduce the problem reliably, so I cannot give you a "recipe", except that it happens when I copy a lot of data at a time.
Any suggestion about how to narrow the problem down? Any more data that you may need? A known bug? Am I doing any stupidity?
Thanks a lot in advance :)
Raúl Núñez de Arenas Coronado
-- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - 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/
| |