Re: ProDOS Kernel Rewritten

[mjmahon@aol.com (Michael J. Mahon)]

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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