[CentOS] HDD badblocks

[J Martin Rushton]

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I suspect that the gold layer on edge connectors 30-odd years ago was
a lot thicker than on modern cards.  We are talking contacts on 0.1"
spacing not some modern 1/10 of a knat's whisker.  (Off topic) I also
remember seeing engineers determine which memory chip was at fault and
replacing the chip using a soldering iron.  Try that on a DIMM!

On 19/01/16 00:39, Peter wrote:
> On 19/01/16 12:34, J Martin Rushton wrote:
>> Not new: I can remember seeing DEC engineers cleaning up the 
>> contacts on memory boards for a VAX 11/782 with a pencil eraser 
>> c.1985.  It's still a pretty standard first fix to reseat a card
>> or connector.
> 
> I used to do that as well.  The contacts would come out nice and
> shiny when you clean them.  Then I found out that what I was
> actually doing was removing the very thin layer of gold plating on
> the contacts and revealing the copper underneath.  That's why you
> should never clean contacts with a pencil eraser, just re-seat the
> boards and they'll make contact again.
> 
> 
> Peter _______________________________________________ CentOS
> mailing list CentOS at centos.org 
> https://lists.centos.org/mailman/listinfo/centos
> 
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