[Coco] Another Coco Virtual Disk Util

[Walt Zydhek]

All documentation I have read calls it a Sector Allocation Bitmap or MAP.
RSDOS uses a GranuleMap. Never seen either called a FAT as it's called in
the MSDOS world, but regardless, they serve the same purpose and I
understood what he meant.

-Walt Zydhek

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Gene Heskett
Sent: Monday, October 21, 2013 5:11 PM
To: coco at maltedmedia.com
Subject: Re: [Coco] Another Coco Virtual Disk Util

On Monday 21 October 2013 20:05:01 Theodore (Alex) Evans did opine:

> On 10/21/2013 03:57 PM, Wayne Campbell wrote:
> > related, because the source image may have allocated sectors in the 
> > FAT
> 
> OS-9 disks don't have a FAT (File Allocation Table).  Whether or not 
> sectors are allocated is stored separately (in the disk allocation
> map) from file structure.

Name confusion Alex, os9 has been calling that disk area from LSN1 to
LSN$100 (max, or however many it takes) the FAT since its first release.  
The address of the / directory in LSN0 is for its FD sector to start in the
next sector after the FAT, and the directory itself is the next 7 sectors in
sequence.

Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)

Words have a longer life than deeds.
		-- Pindar
A pen in the hand of this president is far more dangerous than 200 million
guns in the hands of
         law-abiding citizens.

--
Coco mailing list
Coco at maltedmedia.com
http://five.pairlist.net/mailman/listinfo/coco