Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 08 Dec 2006 10:16:36 +0100 | From | Matthias Schniedermeyer <> | Subject | Re: single bit errors on files stored on USB-HDDs via USB2/usb_storage |
| |
Pete Zaitcev wrote: > On Thu, 07 Dec 2006 20:41:12 +0100, Matthias Schniedermeyer <ms@citd.de> wrote: > > >>>>I'm using a Bunch auf HDDs in USB-Enclosures for storing files. >>>>(currently 38 HDD, with a total capacity of 9,5 TB of which 8,5 TB is used) >>>>[....] >>>>This time i kept the defective files and used "vbindiff" to show me the >>>>difference. Strangly in EVERY case the difference is a single bit in a >>>>sequence of "0xff"-Bytes inside a block of varing bit-values that >>>>changed a "0xff" into a "0xf7". > > >>>This was almost certainly caused by hardware flaws in the USB interface >>>chips of the enclosures. There's nothing the kernel can do about it >>>because the errors aren't reported; all that happens is that incorrect >>>data is sent to or from the drive. >> >>So pretty much all ich can do is to pray that the errors don't corrupt >>the Filesystem-Metadata (XFS). > > > No, this is not all. You should buy a variety of different enclosures > with different chipsets (e.g. find a Freecom if you can),
That would definetly cost way to much money and time to be in any way "efficient".
> and also use decent cables.
I replaced all cables with "High Quality"-cables. But as a "Joe user" it is practically impossible to really know if the cables are good. All i can say is that the "original" cables that came with the enclosures appear a bit thin and the ones i bought appear much more thick, have gold plated contacts and have a massive plaited shielding IOW appear much more trustworthy. But, as i said, in the end i can't really know if they are better than the original ones.
Bis denn
-- Real Programmers consider "what you see is what you get" to be just as bad a concept in Text Editors as it is in women. No, the Real Programmer wants a "you asked for it, you got it" text editor -- complicated, cryptic, powerful, unforgiving, dangerous.
- 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/
| ![\](/images/icornerr.gif) |