[Coco] Nitros-9 Dir size

[Luis Fernández]

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
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