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Re: Limitations

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druck <news@druck.org.uk> wrote:
> On 12/01/2026 13:27, Chris Newman wrote:
> > I'm trying to remember if there is a limit to the number of files a
> > directory can hold in R  Adjust 4.39. Don't think I've got a guide here
> > in the Antipodes.
> 
> On Filecore formatted storage directories can grow to accommodate more 
> files until they reach 4MB. The number of files will depend on the 
> length of the filenames, the 28 bytes of meta for each file, and another 
> ~36 bytes overhead.

I believe the 'old' formats were:
S/M/L: 47 files per directory (BBC Master)
D/E/F: 77 files (D = Arthur, E = RISC OS 2, F = RISC OS 3)

and it's the 'F+' format that allows 'unlimited' files (and >10 char
filenames), up to the limits you cite.

Everything recently formatted will be F+, but some old discs (old
floppies?) may be E or F with the old limits.  IIRC there is no difference
between E or F when formatting hard drives, F was just introduced for 1.6MB
HD floppies as against 800KB E-formatted floppies.

Theo

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Limitations Chris Newman <mec@npost.uk> - 2026-01-13 00:17 +1050
  Re: Limitations Martin <News04@avisoft.f9.co.uk> - 2026-01-12 16:43 +0000
    Re: Limitations Chris Newman <mec@npost.uk> - 2026-01-13 10:20 +1050
  Re: Limitations druck <news@druck.org.uk> - 2026-01-13 00:38 +0000
    Re: Limitations Theo <theom+news@chiark.greenend.org.uk> - 2026-01-13 17:04 +0000
      Re: Limitations Chris Newman <mec@npost.uk> - 2026-01-15 14:02 +1050
        Re: Limitations Chris Newman <newslists@npost.uk> - 2026-02-02 16:35 +0000

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