1 Feb
2022
1 Feb
'22
9:57 a.m.
Sent from my iPad
On Feb 1, 2022, at 10:43, Jon Elson via cctalk
<cctalk at classiccmp.org> wrote:
?On 2/1/22 00:38, Peter Corlett via cctalk wrote:
That is not accurate. CKD files (and FBA files, for that matter) can have multiple
*extents*. An extent is contiguous by nature, but if a file has multiple extents it is
not contiguous other than by coincidence.
Side note: Intergraph made disk controllers for the PDP11 and Vaxen that required
graphics files (IGDS) to be contiguous so that the on-board CPU could scan for graphic
element characteristics (layer, type, etc.)
On Mon, Jan 31, 2022 at 07:51:28PM -0500, 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.
Well, the IBM 360 CKD disks had all files contiguous, too.
Jon