8 Apr
2021
8 Apr
'21
11:38 a.m.
On 08/04/2021 17:29, Chuck Guzis via cctalk wrote:
On 4/8/21 8:40 AM, Eric Smith wrote:
I must be missing something. I understood (for WORM) "unwritten" to mean
"never written" rather than "written but its address is no longer in the
FS catalogue".
So with WORM (whether DEC RVxx style optical disk or CD/DVD-RW in
certain modes) you can (if the firmware allows) read sectors that
contain stale data.
But (afaict) a sector that has never been written is just that:
unwritten. How does it convey any information (other than "I'm still
blank")?
Antonio
--
Antonio Carlini
antonio at acarlini.com
On Thu, Apr 8, 2021, 09:34 Chuck Guzis <cclist
at sydex.com
<mailto:cclist at sydex.com>> wrote:
There's a big difference--in a WORM, unwritten sectors *mean* something.
For archival purposes, in what way does an unwritten sector on a WORM
mean more than an unwritten sector (with no data field present) of a
floppy? Neither can be accurately archived without representing the fact
that it is unwritten.
Simple--a WORM contains the entire history of information on
the disc;
nothing is ever lost. A floppy can have data overwritten--and probably
does (e.g. directories and allocation maps) The only way to update a
WORM is to add to it.