Thomas & all,

From: "Thomas Schmitt" <scdbackup@gmx.net>
Date: Fri, 30 Jan 2026 10:20:52 +0100
peter@easthope.ca wrote:

My knowledge of ISO 9660 is cursory but note the first sentence
in https://en.wikipedia.org/wiki/Optical_disk_image ,
"... disk image ... written to an optical disk, disk sector by disc sector ...".

I don't find that statement in the wikipedia page.
It begins by:
"A disk image is a snapshot of a storage device's content ? typically
stored in a file on another storage device."

Thomas, I cited https://en.wikipedia.org/wiki/Optical_disk_image .

You read https://en.wikipedia.org/wiki/Disk_image .

Two different pages. If the URL I cite doesn't pop a browser, the URL
can be taken to a browser via a system clipboard.

Thx, ... P.


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--- PyGate Linux v1.5.8
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

peter@easthope.ca wrote:

Thomas & all,

From: "Thomas Schmitt" <scdbackup@gmx.net>
Date: Fri, 30 Jan 2026 10:20:52 +0100
peter@easthope.ca wrote:

My knowledge of ISO 9660 is cursory but note the first sentence
in https://en.wikipedia.org/wiki/Optical_disk_image ,
"... disk image ... written to an optical disk, disk sector by
disc sector ...".

I don't find that statement in the wikipedia page.
It begins by:
"A disk image is a snapshot of a storage device's content ?
typically stored in a file on another storage device."

Thomas, I cited https://en.wikipedia.org/wiki/Optical_disk_image .

When I go to that URL (as shown in my browser's URL bar) I am shown the
page accessed from the URL below, prefaced by the text "(Redirected
from Optical disk image)"

You read https://en.wikipedia.org/wiki/Disk_image .

Two different pages.

So no, they're not two different pages, at least not here or presumably
in wherever Thomas is. There are some mention of optical disks on the
page.

If the URL I cite doesn't pop a browser, the
URL can be taken to a browser via a system clipboard.

Thx, ... P.

--- PyGate Linux v1.5.8
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

From: debian-user@howorth.org.uk
Date: Fri, 30 Jan 2026 16:33:47 +0000

When I go to that URL (as shown in my browser's URL bar) I am shown the
page accessed from the URL below, prefaced by the text "(Redirected
from Optical disk image)"

Thanks debian-user@howarth. Yep. Something fishy in Wikipedia.

fdisk shows that the archive drive here is not formatted. Beyond that
you can see the tail end of the table of contents.

# fdisk /dev/sdd

Welcome to fdisk (util-linux 2.41).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

The device contains 'iso9660' signature and it will be removed by a write comman
d. See fdisk(8) man page and --wipe option for more details.

Device does not contain a recognized partition table.
Created a new DOS (MBR) disklabel with disk identifier 0xcbfb7864.

Command (m for help): <Ctrl><C>

# xorriso -dev stdio:/dev/sdd -toc | tail
xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.

xorriso : NOTE : Loading ISO image tree from LBA 0
xorriso : UPDATE : 5002 nodes read in 1 seconds
Drive current: -dev 'stdio:/dev/sdd'
Media current: stdio file, overwriteable
Media status : is written , is appendable
Media summary: 48 sessions, 4339255 data blocks, 8475m data, 457g free
Volume id : 'BOB.2026.01.25.19:28:23'
ISO session : 41 , 4255168 , 40893s , BOB.2026.01.25.07:14:15
ISO session : 42 , 4296064 , 527s , BOB.2026.01.25.10:03:38
ISO session : 43 , 4296608 , 527s , BOB.2026.01.25.18:15:47
ISO session : 44 , 4297152 , 527s , BOB.2026.01.25.18:18:01
ISO session : 45 , 4297696 , 40536s , BOB.2026.01.25.18:50:59
ISO session : 46 , 4338240 , 527s , BOB.2026.01.25.19:08:06
ISO session : 47 , 4338784 , 527s , BOB.2026.01.25.19:22:36
ISO session : 48 , 4339328 , 681s , BOB.2026.01.25.19:28:23
Media summary: 48 sessions, 4339255 data blocks, 8475m data, 457g free
Media nwa : 4340032s
#



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--- PyGate Linux v1.5.8
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

From: David Wright <deblis@lionunicorn.co.uk>
Date: Fri, 30 Jan 2026 16:24:22 -0600

There are two different pages being consulted here:

https://en.wikipedia.org/wiki/Optical_disc_image

and:

https://en.wikipedia.org/wiki/Disk_image

the second one being reached by a redirect from:

https://en.wikipedia.org/w/index.php?title=Optical_disk_image&redirect=no

The chaos was mostly because I cited Optical_disk_image rather than Optical_disc_image.

Fixed now. https://en.wikipedia.org/wiki/Optical_disk_image redirects
to https://en.wikipedia.org/wiki/Optical_disc_image.

The first sentence in "Optical disc image" also has link "disk image" to Disk_image.

Spelling covered here.
https://en.wiktionary.org/wiki/disk#Alternative_forms https://en.wiktionary.org/wiki/disk#Usage_notes

The author of the first page can't even manage a consistent spelling
in the five words "disk sector by disc sector", quoted by the OP.

Many people have seen that. The blame is spread widely. https://en.wikipedia.org/w/index.php?title=Optical_disc_image&action=history

Easily fixed. Just click on Edit near the top and correct as you see
fit.

Thx, ... P.

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--- PyGate Linux v1.5.10
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Sat 31 Jan 2026 at 17:55:58 (-0700), peter@easthope.ca wrote:

From: David Wright
Date: Fri, 30 Jan 2026 16:24:22 -0600

There are two different pages being consulted here:

https://en.wikipedia.org/wiki/Optical_disc_image

and:

https://en.wikipedia.org/wiki/Disk_image

the second one being reached by a redirect from:

https://en.wikipedia.org/w/index.php?title=Optical_disk_image&redirect=no

The chaos was mostly because I cited Optical_disk_image rather than Optical_disc_image.

Fixed now. https://en.wikipedia.org/wiki/Optical_disk_image redirects
to https://en.wikipedia.org/wiki/Optical_disc_image.

Bravo.

The first sentence in "Optical disc image" also has link "disk image" to Disk_image.

Spelling covered here. https://en.wiktionary.org/wiki/disk#Alternative_forms https://en.wiktionary.org/wiki/disk#Usage_notes

The author of the first page can't even manage a consistent spelling
in the five words "disk sector by disc sector", quoted by the OP.

Many people have seen that. The blame is spread widely. https://en.wikipedia.org/w/index.php?title=Optical_disc_image&action=history

Easily fixed. Just click on Edit near the top and correct as you see
fit.

It had occurred to me that the author(s) might be trying to emphasise
that sectors were going to be read off a magnetic disK and written
onto an optical disC. Otherwise, it would be more idiomatic just to
put "sector by sector".

However, I'm not convinced that you can do that, because the disK
with the image on it could have 512-byte sectors, yet the optical
disC sectors are more likely to be twice or four times that. (I'm
the dumb one here, so I hesitate to make changes and misinform.)

Cheers,
David.

--- PyGate Linux v1.5.10
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)