🚀 go-pugleaf

In article <ARM200-921109172536-1C45F389*@MHS>, /G=Rhodri/S=James/O=SJ-Research/ADMD=INTERSPAN/C=GB/@mhs-relay.ac.uk writes:
> ijp@doc.ic.ac.uk (Ian Palmer) writes:
> 
>>Over the weekend I suddenly (well over the period of a few mins) lost
>>3.5Meg of my hard disc free space. I was archiving some files and what
>>appeared to happen is that every time a new file was placed in the
>>archive (producing a copy of the archive temporarily) the old one at
>>the end was NOT being added to the free space map (or is it taken
>>away?) on my IDE (A5000) hard disc.
> 
> I suspect that you are the victim of map rot.  It can happen that when doing
> lots of writing/deleting, RiscOS fails to link now unused areas of disc onto
> the free list, resulting in a number of phantom objects in the map, rotting
> away the free space.  Owen tells me that RO 3.1 is the least prone to map
> rot, by the way.  It's also the only version on which I've actually observed
> the problem, but never mind.
> 

How does compacting the drive affect this "rotting" of the free map. 

Also, could you post the alternative methods for recovering the free space map; 
this will be interesting to know for future reference.

		From Martin Glanvill	(mcg@waikato.ac.nz)

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