[Coco] DECB FAT question

[Bob Devries]

Actually, Willard, there is a bad granule code. Any granule marked $C0 in 
the granule map will, I believe be treated as allocated, and ignored.
--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Willard Goosey" <goosey at virgo.sdc.org>
To: <coco at maltedmedia.com>
Sent: Wednesday, January 17, 2007 5:21 PM
Subject: Re: [Coco] DECB FAT question


> >Date: Tue, 16 Jan 2007 11:31:23 -0600
>>From: Roger Taylor <operator at coco3.com>
>
>>I think that Disk BASIC checks the FAT data alone, not the directory
>>entries, to see which granules on the disk are free.
>
> Seems to be the consensus.  I think the only programs that would have
> a problem are ones that already ignore the CoCo directory and FAT.
>
>>In fact, you can "fix" faulty disks by marking the bad sectors
>>(actually, 9 at a time, a granule), as bad or unuseable.  The file
>>storage routines will skip right over those granules when looking for
>>free ones.
>
> Would have been nice if Microsoft had specified a "bad granule" code.
> Well, the only real difference is that bad sectors marked used will
> still cause problems with BACKUP.  Well, they did have to pack
> everything into a small ROM.
>
> Willard
> -- 
> Willard Goosey  goosey at sdc.org
> Socorro, New Mexico, USA
> "I've never been to Contempt!  Isn't that somewhere in New Mexico?"
>   --- Yacko
>
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