Re: Question: EMI Shielding for IDE cables

From: Bob Masta (NoSpam_at_daqarta.com)
Date: 08/20/04 

Date: Fri, 20 Aug 2004 12:30:19 GMT

On Thu, 19 Aug 2004 13:55:45 GMT, "blue" <user@host.com> wrote:

<snip>
>
>The reason why I think it is interference of some sort:
>I did some checking of a bunch of corrupt files in a hex editor. I actually
>had chunks of text from other text files. So data got scrambled up during
>read/writes to the drives.

The fact that you are seeing chunks of text from *other* files
indicates that the FAT is screwed up. If your problem was
transmission errors which somehow made it past the error correction
stuff (which I think is not too likely, but possible), then you would
have erroneous data in the file you sent. Most likely it would just
look like garbage, or random byte replacements. I can't see any
way that it could be parts of other files, barring some otherworldly
interaction between parallel cables on 2 drives during simultaneous
writes. Not likely!

Of course, the FAT on the drive is also written by the same process
that writes the rest of the file. So it's *possible* that some kind
of noise pickup could corrupt the FAT data as it was updated. There
are 2 copies of the FAT, so if they both are identical I'd say that
was proof the trouble was somewhere else, in software. If it was
noise in transmission, they would be different.

If your drives use something other than FAT, like NTFS, then
the same reasoning applies. But I don't know if or where they
maintain a 2nd copy.

Best regards,

Bob Masta
dqatechATdaqartaDOTcom
 
            D A Q A R T A
Data AcQuisition And Real-Time Analysis
           www.daqarta.com

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