On 2022-01-31 6:19 p.m., Bill Gunshannon via cctalk wrote:
On 1/31/22 20:13, Fred Cisin via cctalk wrote:
On Mon, 31 Jan 2022, Paul Koning via cctalk wrote:
Yes, RT-11 is a somewhat unusual file system in that it doesn't just support contiguous files -- it supports ONLY contiguous files.  That makes for a very small and very fast file system.

The only other example I know of that does this is the PLATO file system.

The UCSD P-System had contiguous files.  If small files had been deleted, so that space was fragmented, you had to run a "CRUNCH" program to defragment it.   Directory entries had the starting location and length.

That was a minor inconvenience.  The bigger problem was that on a
"CRUNCHed" disk you could only open one file for writing. Attempt to
open a second returns an error.

bill

How are text files handled the above systems?
The editor writes to a temp file, then deletes
the old file, and renames the temp file?
Ben.


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