Date   : Thu, 14 Sep 2006 23:36:21 +0100
From   : "BRAHMS" <dominic@...>
Subject: Re: Domesday Disaster

----- Original Message ----- 
From: "Jules Richardson" <julesrichardsonuk@...>
To: <bbc-micro@...>
Sent: Thursday, September 14, 2006 3:05 PM
Subject: Re: [BBC-Micro] Domesday Disaster


> Ian Wolstenholme wrote:
>> It had to happen!  During the last chunk of DATA2 on the
>> South side of the Community disc I got "Disc error 3 at :0/0F0948"!!
>>
>> Hoping against hope here, but could this be something simple like
>> a dirty/dusty disc
>
> Quite possibly. Hmm, don't LV discs track from the outside inwards (unlike 
> CDs that go from the inside outwards)? Which if you're doing a raw dump 
> probably means any fault is likely near the centre given how far through 
> you got...
>
> > and if so, what would be the best way to clean
>> it and which surface is being read when the disc is in the drive?
>
> The laser reads the underside of the disc. Careful use of a non-abrasive 
> cloth and some warm soapy water should do fine for cleaning off dust I'd 
> have thought.
>
> At recommendations of others I've used brass polish before to remove 
> scratches from CDs - I'd imagine that LV discs are a similar plastic 
> material and it'd work just as well for those (I've not tried it on a LV 
> disc, but I'd be prepared to risk it, if that helps!). Silver polish 
> should be fine too - just don't use anything like Jif (or Cif or whatever 
> it is these days!) as that'd be too abrasive.
>
I used produce CDs years ago and the best advice I can give (which you 
probably
already know) is DO NOT wipe like a record (i.e. holding the cloth and 
rotating
the disc) instead clean gently from the centre out to the edge. If you do it 
the
wrong way you risc making a circular scratch which the heads will try to 
follow!
Far better one against the grain as it were.

Good luck...

dom