Re: ProDOS Kernel Rewritten

["Bryan Parkoff" <BParkoff@satx.rr.com>]

Michael,

    You are right that $FFFFFF block equals to 8GB.  If it is going to be
$FFFFFFFF block that will equal to 2TB.


"Michael J. Mahon" <mjmahon@aol.com> wrote in message
20021026145920.06410.00000841@mb-ch.aol.com">news:20021026145920.06410.00000841@mb-ch.aol.com...
> Bryan Parkoff asked:
>
> >> Bryan,  it is not necessary for a disk to be addressed below the block
> >level,
> >> which for ProDOS is 512 bytes.  Simply adding another high-order disk
> >> address byte will get you 256x32MB or 8GB addressable capacity.
> >
> >    What do you mean 256x32MB?  Is it like 256 sectors?  It may be over
> >hundred thousand sectors.  It will allow 1024 bytes per sector instead of
> >512 bytes per sector or higher that will improve performance when it
> >accesses to read and write faster.
>
> I mean that a 2-byte disk address will access up to 64K blocks, or
> 32MB, and a 3-byte disk address will access up to 256x64K blocks
> (or 16M blocks), or 8GB.  Each disk block is 512 bytes, and file
> system data structures only address disk to the block.
>
> -michael
>
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