[Info-vax] Request description of UFS for VMS person

[Bob Eager]

On Wed, 22 Apr 2009 11:51:40 UTC, billg999 at cs.uofs.edu (Bill Gunshannon)
wrote:

> In article <gsms0d$dn$3 at naig.caltech.edu>,
> 	glen herrmannsfeldt <gah at ugcs.caltech.edu> writes:
> > Bill Gunshannon <billg999 at cs.uofs.edu> wrote:
> > (snip)
> >  
> >> Are you saying that the blocks used by a file that has been deleted are
> >> not going to be reused?  Assuming a decent file allocation scheme I would
> >> expect the freed blocks to be in locations that were likely to be considered
> >> prime real estate for the next file that needed space.
> > 
> > The MS_DOS allocation method seems to be such that the most
> > recently allocated blocks are the last to be reused, assuming
> > no reboot in the mean time.  As well as I understand it, there
> > is a pointer to the last allocated blocks that is incremented
> > until it gets to the end, and then starts over from the beginning.
> 
> And why does an alocation scheme as bad as this not surprise me?
> No wonder we spent so much time de-fraging MSDOS.  :-)

It's there to make undelete useful. And that was only on MS-DOS, where 
disks were reasonably small.

-- 
Bob Eager