Re: tapes best for backup?
On Sat, Jan 05, 2008 at 03:12:31PM -0600, Hugo Vanwoerkom wrote:
> Douglas A. Tutty wrote:
> >On Sat, Jan 05, 2008 at 02:53:45AM -0500, Rick Thomas wrote:
> >
> >>As a registered pack-rat, I've got a drawer full of similar old CD-
> >>Rs. If I get ambitious and I've got some free time, I'll try a bunch
> >>more, just for fun...
> >
> >I wonder what cdck would show. It tests not only ability to read the
> >files, but counts any otherwise silent errors as well. It also
> >automates the reading every file process.
> >
>
> Curious little program: none of my CD-R's are rated anygood. Use them
> all the time. Maybe it has problems with the disk "ends". Clearly I'm a
> user, not a developer.
>
I use it to check all my CD-Rs intended for backup before I consider
them done. The program is supposed to be able to verify track layout to
predict its readability by other drives, and the strength of the signal
to predict its longevity.
I've never seen cdck say a disk wasn't "anygood", just "excellent" or, I
believe, "satisfactory". I tend to get "satisfactory" if I use a fast
burn speed (e.g 16x) and "excellent" if I use a lower speed (e.g. 4x),
even though the buffers are shown to never have been emptied. I wonder
if the drive slowing down the burn to prevent a buffer under-run can
cause problems that cdck can detect.
Doug.
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