Paul's problem is....
>It is a scan of a b/w neg and it has 
> a black line running across  the entire width. When viewed at around 
> 800% you can see that it is exactly 6 pixels wide and it is almost as 
> if a line of information has disappeared! The line was definitely not 
> there when I scanned it as I spent a while playing with the tone and I 
> would have noticed, even this time of year!

Philip suggested
>That leads me to believe that it was a disk error upon saving.

I have my doubts about this idea (with digital and seasonal respect). The
info on the disk I am sure would not be uniform in relation to the image.
The operating system drops data anywhere it can (hence the need for defrag
software). If contiguous data at disk level becomes corrupted, I doubt very
much that the data represents contiguous pixels in the image. Also, my
experience is that if there is some sort of corruption, it does not affect
data in a uniform way. 

Have you tried rescanning? Then try saving the file without any changes,
then do a 'save as' and see if the line appears (I suspect it won't). I
would suggest that for a line to appear across the image, something must
have happened in PS.

Are the pixels r0g0b0? What I am driving at is trying to ascertain that the
pixels exist in the image and are not something external. If there was some
sort of disk problem, why has it very conveniently made a band 6 pixels wide
right across your image? 

Hope this helps and best wishes.

Paul
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