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[filmscanners] Re: CD RW Problem

You are correct that there are two incompatible standards.  Unlike CD-R,
CDRWs are of a factory pre-determined maximum speed written into them.
The original CDRW disks were 1X, when 2X came along, they could be
written at either 1X or 2X.  Finally, the 4X disks appeared.  These can
be written at 1X, 2X or 4X speed.  That was the end of the original CDRW

The new "high speed" CDRW are not at all compatible with the slower
1X-4X CDRW write drives.  The newest version of these new CDRW disks
(that I have seen) are 12X write.  They should work at 12X, 10X, 8X, 6X,
and 4X, with the newer "high speed" CDRW drives.  They will not work
with the older drives at all.  Of course, there are slower maximum "high
speed" CDRW disks out there, that may only go up to 6X or 8X, as well.


Mike Brown wrote:

> John
> I wonder what speed your CD burner is?
> I started having really odd problems like yours about a year ago. I threw
> away a few CD-RW disks, including some Memorex ones, because they seemed
> prone to flaky operation. It's possible there was a bad batch of disks but
> when I got a new CD burner in the office I had a lightbulb moment.
> It seems there are now two, partly incompatible, standards for CD-RW disks.
> If you look at the Compact Disc logo you'll see newer disks say "high speed"
> underneath. These disks are meant for new high speed drives and are
> incompatible with older, slower drives for burning (you can read them OK but
> not burn them reliably).
> The trouble is the industry went through an interim phase producing
> "multi-speed" disks which don't really work in slower drives (my drive is
> only 2x - somehow buying cameras, scanners & printers seems a higher
> priority than a new CD burner).
> Solution? I managed to find a dealer with some 2x disks in stock - these
> work fine. I also noticed that TDK now do two different disks - one for slow
> drives and one for higher speed. I've only tried one of the TDK disks so far
> but it did seem to work OK. I need to do more extensive testing before
> trusting images though! I have to say I prefer CD-R for longer term storage,
> although I've got an audio CD-R which no longer wants to play.....
> Good luck
> Mike Brown

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