[Coco] Nitros-9 Dir size

Sat Mar 30 01:24:27 EDT 2013

The IT.SAS can be changed with the DMODE command:

dmode /dx sas=16

You'll notice that usually the SAS of a hard disk is set to $20, and for a 
floppy it is 8.

Hope that helps.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Luis Fernández" <luis46coco at hotmail.com>
To: "COCO" <coco at maltedmedia.com>
Sent: Saturday, March 30, 2013 2:50 PM
Subject: Re: [Coco] Nitros-9 Dir size

Ahh, Ok
but this parameters is in memory, is not registered on the disc format, 
therefore, the new sub-dir will have the size you  specify the parameter in 
memory, and this may be different for each computer or user, in other words, 
the size stored to a  new subdir could be different from the ROOT

But this parameter can not be changed with a command console, do you?would 
have to directly manipulate the parameters for this device?

I'll try to put this in my CoCoDskUtil parameter, which may be able to 
achieve more sectors if used few files or directories  fracmentacion avoid, 
enlarging them from the start

I think the format command should have that parameter, or to create a new 
subdir
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Making  CoCoDskUtilPack V 1.1.5.zip, Scan magazines and organize maltedmedia
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> From: devries.bob at gmail.com
> To: coco at maltedmedia.com
> Date: Sat, 30 Mar 2013 14:26:05 +1000
> Subject: Re: [Coco] Nitros-9 Dir size
>
> Luis,
>
> are you referring to the PD.SAS setting in the RBFMan options sections
> (refer page 5-7 of OS-9 Technical reference), which is also in the Device
> Descriptor (as IT.SAS at offset $20 on page 5-9)?
>
> Although this appears to refer to files, it should be noted that a 
> directory
> in OS-9 is just a special purpose file.
>
> Regards, Bob Devries
> Dalby, QLD, Australia
>
> ----- Original Message ----- 
> From: "Luis Fernández" <luis46coco at hotmail.com>
> To: "COCO" <coco at maltedmedia.com>
> Sent: Saturday, March 30, 2013 1:22 PM
> Subject: Re: [Coco] Nitros-9 Dir size
>
>
> I have understood that they reserve 9 sectors, one header and 8 for 64 
> names
> each name uses 29 bytes + 3 Start sector number of the file, total 32 
> bytes
> 8 names fit by sector
>
> the problem is that not what is the command to create a different initial
> size or other size subdir
>
> > From: gheskett at wdtv.com
> > To: coco at maltedmedia.com
> > Date: Fri, 29 Mar 2013 20:02:30 -0400
> > Subject: Re: [Coco] Nitros-9 Dir size
> >
> > On Friday 29 March 2013 19:42:17 Luis Fernández did opine:
> >
> > > In a new disk NitrOS-9 sectors size reserved for ROOT Dir is 9 
> > > sectors,
> > > 1 sector for the sequence of sectors and 8 for file names.
> > >
> > The last time I walked through that code, the initial allocation from 
> > the
> > FAT was 8 sectors, and it used the first one for the file descriptor
> > sector.
> >
> > This means there are only 54 named entries (and the . and .. entries)
> > allowable in this initial disk allocation.  I looked see it there was 
> > some
> > way I could use the SAS in the descriptor to enlarge this, but it would
> > have been a major re-write.
> >
> > So generally, the 55th name entry in the root directory will then get
> > another SAS sized allocation.  For files I recommend a SAS of at least 
> > $20
> > to cut down on file fragmentation as it can be allocated, even set at 
> > $FF
> > if there is enough room on the disk, because whatever is not used will 
> > be
> > released as part of the file closing, so you don't waste a lot of disk 
> > by
> > reserving 254 sectors but only using 12.  But a directory allocation is
> > fixed lenght forever, so making a 254 (dmode sas=FE /device) sector
> > directory is, particularly on floppies, a huge waste.  When you go past
> > the
> > end of the original 54 names, leave sas at 8 because thats room enough 
> > for
> > 64 additional names /in that directory extension/.  Big HD's of course 
> > are
> > an entirely different horse, so my default sas setting on the pair of 
> > 1Gb
> > seagates is $20.
> >
> > > The point is, there is a parameter in OS9/Nitros-9 allow me to create
> > > new disks / Dir or Sub-Directories more or less of sectors (more or
> > > less amount of file names), initial reserve
> > >
> > > Of course I know this can be expanded by adding sectors to sectors dir
> > > sequence, but initially I say?
> > >
> > Format makes the original root dir, and its fixed at an FD and 7 for 
> > data.
> >
> > After that, for all other new directories, and extensions to existing
> > ones,
> > the size is controlled by IT.SAS in that drive/partitions descriptor.
> >
> > 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)
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> > I was taught to respect my elders, but its getting
> > harder and harder to find any...
> >
> > --
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