On 01/12/2015 08:13 AM, Bill Gill wrote:

[snip]

Even with the disk still spinning there wouldn't be any
wear, since the laser wouldn't be concentrated on one spot.
As far as I know the disk would keep spinning. It doesn't
take that long for the disk to spin back to where it was
reading because it is spinning very fast so there would
be no perceptible loss of time waiting for it to start
reading again. The data is buffered, but I think that is
more a matter of having time to get all the data together
before presenting it. Technically it is possible for
the data on the disk to be stored discontinuously. That
is one part could be on one part of the disk and the next
part on a completely different part. I doubt if it is in
a DVD, but if you make a disk image of your computer hard
drive it could quite easily be that way.

Bill

The data on DVD (or CD or blu-ray) is not stored continuously (like a
VCR), but in sectors (like a computer drive). There will be some delay
while reading the sector headers, and error correction code.

--
Mark Lloyd
http://notstupid.us

"The Christian religion not only was at first attended with miracles,
but even at this day cannot be believed by any reasonable person without
one." -- David Hume