Re: How many K does a ProDOS Apple IIe of IIc floppy hold?

[Pim Blokland <pDOTblokland@spcgroup.nl>]

Mitchell Spector wrote:
> 
>     Once the disk is formatted there is small bit of space used by
> the filing system, leaving about 136.5K for ProDOS disks and a bit
> more (or was that less?) for DOS 3.3. This all assumes 16 sectors

DOS 3.3 disks all had the complete operating system on them, so they all
were bootable.
Of course, it was possible to create disks with no DOS on them, but not
using Apple's tools.
Therefore, ordinary ProDOS disks usually had more space free than
ordinary (bootable) DOS 3.3 disks. (This was different for bootable
ProDOS disks, since ProDOS uses up a lot more disk space.)

Apart from this, there is also the little matter of block size. DOS 3.3
uses 560 sectors of 0.25K, while ProDOS uses 280 blocks of 0.5K. So
while in theory a ProDOS disk holds the same amount of information as a
DOS 3.3 disk, in practice it can usually store less, having more wasted
space.
-- 
Pim Blokland
if replying by e-mail, replace the DOT in my name with a dot.