[Coco] Another Coco Virtual Disk Util

[Gene Heskett]

On Wednesday 23 October 2013 14:13:53 Wayne Campbell did opine:

> I may be mis-remembering something. I do recall that if I change the
> cluster size it will affect how many sectors are used when allocating
> space for a file, or to increase the allocation for a file. The minimum
> is 1-sector clusters, and over a certain size of drive space (I seem to
> recall it being $5A000) you cannot use 1-sector clusters.
> 
> If someone knows what I am talking about, please feel free to correct me
> or back me up, whichever is required.
> 
> Wayne
 
In decimal sizes, it falls over at slightly above 131 megabytes, or if 
speaking in hex, 128 megabytes in 1024 per kilobyte measure.
above that, cluster size has to grow in powers of 2.  I have 2 1Gb drives, 
the original uses a cluster size of 4 and is about 480 megabytes so I can 
use some of the rest as HDBDOS vdrives, the added twin is at cluster 
size=16 ($10 in hex) as the whole gigabyte is formatted for os9.

>  On Oct 22, 2013 10:54 PM, "Bob Devries" <devries.bob at gmail.com> wrote:
> > Wayne,
> > I think you're confusing Segment Allocation Size with Cluster Size.
> > They are totally different.
> > 
> > Cluster size is determined at format time (on the Format command line
> > in NitrOS9), and is the number of sectors which are "clustered"
> > together as a single addressable unit. On hard disks, this can be set
> > to any number (must be power of 2).
> > 
> > Segment allocation size is the number of sectors (or clusters)
> > allocated at one time when creating or extending a FILE on the disk.
> > Remember, a directory is just another file to OS-9.
> > 
> > Regards, Bob Devries
> > Dalby, QLD, Australia
> > 
> > ----- Original Message ----- From: "Wayne Campbell"
> > <asa.rand at gmail.com> To: "CoCoList for Color Computer Enthusiasts"
> > <coco at maltedmedia.com> Sent: Wednesday, October 23, 2013 12:13 PM
> > Subject: Re: [Coco] Another Coco Virtual Disk Util
> > 
> > 
> > Luis,
> > 
> > The OS9 format command defaults to 32 sector minimum allocation. You
> > can change it by using the appropriate flag in the command line (not
> > sure of its option name offhand). I learned years ago that the max
> > size set for hd's is because it is the max size you can use 1-sector
> > allocations with. I keep forgetting to specify that when I format a
> > vhd with that command.
> > 
> > Wayne
> > 
> > On Oct 22, 2013 10:02 PM, "Luis Fernلndez" <luis46coco at hotmail.com> 
wrote:
> >  Wayne. I think that  OS9 has PD.SAS  Segment allocation size
> >  
> >> Minimum size of segment allocation (number of sectors to be allocated
> >> at one time)
> >> I think it is for new directories (usually minimum 8 sectors)
> >> not whether to also file
> >> 
> >> 
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Cheers, Gene
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