Re: CFFA and MicroDrive partitions

["Charlie" <charlieDOTd@verEYEzon.net>]

"Charlie" <charlieDOTd@verEYEzon.net> wrote in message 
news:htq5c0$20d$1@news.eternal-september.org...
>
> "Michael J. Mahon" <mjmahon@aol.com> wrote in message 
> EvSdnT6-0ZEvF53RnZ2dnUVZ_umdnZ2d@giganews.com">news:EvSdnT6-0ZEvF53RnZ2dnUVZ_umdnZ2d@giganews.com...
>> Charlie wrote:
>
>> snip <
>
>>> A ProDOS volume has a two byte entry in the volume directory 
>>> which contains the total number of blocks used.  The highest 
>>> number that can fit into two bytes is $FFFF or 65535 blocks. 
>>> Both the ProDOS 8 Technical Reference Manual and Beneath Apple 
>>> ProDOS say the number is total blocks.
>>
>> It wouldn't be the first time that documentation was incorrect.
>
> True.
>
>> I'd be very surprised if it were not just the maximum block 
>> number,
>> or size-1.  Of course, the programmers may have taken the buggy 
>> path
>> and left the last block out...
>>
>> Can anyone verify if a ProDOS volume is "full" at 65535 blocks 
>> used?
>> Or can all 65536 be used?
>
> I have never actually tried to verify that, but I *have* verified 
> that $118 is the number in the "total_blocks" field on a full 
> 5.25" floppy volume.  $118 is 280 blocks.  35 tracks x 8 
> blocks/track = 280 blocks.  So it would seem the number in that 
> field represents the total number of blocks exactly.
>

I should have left out the word "full" before 5.25" floppy volume 
since this is the blocks on the volume not the blocks used.

Charlie