Date   : Fri, 01 Mar 2013 14:47:09 +0100
From   : nicolagiacobbe@... (nicola giacobbe)
Subject: Odd bug in Watford DFS

Never seen, or at least I was aware of. I made the floppy run for 20 days 
collecting data from the A/D and did not see missing data nor glitching values.
I was using a 8271 DFS (the only one I could afford), but obviously cannot
swear on the order of access to files.

On Thu, 28 Feb 2013 22:15:08 +0100, J.G.Harston <jgh@...> wrote:

> When I worked at W(cough!) E(splutter!)
...
>
> Has anybody encountered this?
>
> DFS 0.90 had a similar problem, something like:
> - Open an output or update file on one surface (eg
> ch1%=OPENUP":0.file")
> - Open an output or update file on the other surface of the same drive
> (eg ch2%=OPENUP":2.file")
> - Before the disk stops spinning:
> -- Write some data to channel 1 (eg BPUT#ch1,0)
> -- Close channel 1
>
> The DFS sees the disk still spinning and as surface 2 was the last
> surface accessed, writes the current catalog to it - ie surface 1's
> catalog!
>


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