On Mar 8, 2011, at 8:53 AM, Jonathan Smith wrote:

> Thanks peeps. Just realised this is the g-group and not the lappy
> group. Doh.
> 
> I haven't cleaned the drive Dan, no. It reads audio CD's flawlessly,
> so I am confident it's clean.

The read heads for CD's and DVD's are different, it's entirely possible for one 
to be dirty and another work. It's also possible for the DVD part to die while 
the CD part still works; the original LG combo drives that came in Pismos were 
notorious for that.

Some batches of disks are just bad, too. I've had to return packages to the 
store when I got several failures in a row, especially if it's been tried on 
different computers. Recordable media is a cheap commodity now, and QC has 
slipped; you cannot pay for a lot of QC when you can't sell the disks for more 
than a $1 or 50 cents each. Back in the day when CDR's were $10 each; they were 
tested more rigorously; nowadays you're probably lucky for 5 tested disks per 
lot, which could be thousands of disks.

-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs


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