3.5" interleave

["Joel" <joelbuckley54.nospam.@hotmail.com>]

There is interleave on Apple 3.5 disks.
4:1 was standard for 800k disks on the Unidisk.
2:1 was standard for 800k disks on the IIgs and Apple 3.5 drive.
IIgs formatter recommends 2:1 for 1.44M disks  for optimum speed.
But a 1:1 option is given, which I believe is the standard for the IBM.

"Dosius" <steve@dosius.zzn.com> wrote in message
9307085f.0209240525.1aec7d4f@posting.google.com">news:9307085f.0209240525.1aec7d4f@posting.google.com...
> In my emulator Dapple 0.8, I have implemented a driver to read/write
> 1.44MB disks.
>
> The disk format follows this pattern, Head 0 Track 0, Head 1 Track 0,
> Head 0 Track 1, Head 1 Track 1, Head 0 Track 2, ..., Head 1 Track 80,
> with interleaving dealt with by the PC BIOS (I think there is none).
>
> How is the layout of a real ProDOS disk, created on a Mac or a Mark
> ][?