[Coco] Nitros-9 Dir size

Sat Mar 30 09:07:12 EDT 2013

Thanks, It's what I wanted to know exactly
Anyway, in my utility will try to leave the possibility of changing the size of a dir

> From: devries.bob at gmail.com
> To: coco at maltedmedia.com
> Date: Sat, 30 Mar 2013 15:24:27 +1000
> Subject: Re: [Coco] Nitros-9 Dir size
> 
> 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
> ---------------------------------------------------------------------------------
> Making  CoCoDskUtilPack V 1.1.5.zip, Scan magazines and organize maltedmedia
> http://cococoding.com/cocodskutil/ Thank Aaron Wolfe
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> Spanish but I live in Venezuela
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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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> > > harder and harder to find any...
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