Hi Jeremiah--
Interesting. What is the result with the failed reads? The bad file
transfers and is corrupt or won't read/copy as an entity on the disc?
Same burner(s) since 2000? What model(s)?
Checking the redundant copies periodically and recopying them every
few years is hard work but managable for drives, not for >1000 disks.
Are you not re-burning your optical disks now and just going to
drives? However at risk, I still see the disks as my best hope in
the likelihood I'll never keep up. A 1TB failing to mount is a bad
thought. :-) Rob
=3D =3D =3D
At 12:25 AM -0700 5/2/11, Jeremiah Moore wrote:
>I'm now migrating some CD-R burns done in 2000 to hard disk. I've had two
>failed reads so far, each time a single file rather than an entire disc.
>
>These were burned on quality stock, either TY or Mitsui (now MAM-A)
>
>Next will be the hard drives not spinning up I expect.
>
>Ultimately, your data will only survive if you maintain redundant copies,
>check it periodically and recopy every few years.
>
>-jeremiah
>
>
>On Sun, May 1, 2011 at 7:46 PM, Rob Danielson <> wrote:
>
>>
>>
>> At 9:51 AM +0100 5/1/11, Chris Edwards wrote:
>> >
>> >
>> >On Sat, 30 Apr 2011, Rob Danielson wrote:
>> >
>> >| ~4 years ago I found several web sites with tests of burners with
>> >| several criteria measured. There were significant differences betwee=
n
>> >| burners.
>> >
>> >Right - and good luck buying a 4-year old burner model :-)
>>
>> Hi Chris--
>>
>> The few reviews I read yesterday suggest to me there are still
>> significant performance differences in today's models. One can still
>> find 4-5 year old drives for sale. Makes some sense that a drive that
>> does not also burn double-layer and BR could be more mechanically
>> reliable at handling vanilla DVD-R's.
>>
>>
>> >
>> >Personally I have little faith in recordable DVDs in the long-term.
>> >Plenty disks I wrote a few years ago are no longer readable :-(
>>
>> This may be consistent with the poor burner/media combination
>> observation. Quite a few burners create disks that will not
>> consistently read on other burners. 4X and 8X burned disks more so.
>> When I noticed this at a lab and on an early iMac and a Powerbook G4,
>> I looked into the matter. After settling with the Pioneer
>> DVR-107D/T-Y silver discs combination, no disks have failed to read
>> even on other drives. I'm burning disc #3064 as I type.
>>
>> I'm more confident about these optical DVD-R disks than I am a boxes
>> of IDE hard drives that hold material.
>>
>>
>> >
>> >One thing I've been told, by an ex-BBC person, is that the "rewritable=
"
>> >DVD media may actually be better, because the chemistry involved is
>> >different, and lasts longer.
>>
>> I think the pits can be read more reliably for a period of time but I
>> don't think the longevity is better than gold/silver media with
>> phthalocyanine dye.
>>
>>
>> >
>> >But as has already been said, the only way to be sure is to periodical=
ly
>> >copy stuff to fresh media. Hence I now keep everything on live hard
>> >disks.
>>
>> Smart, but if one has more than 3-5 drives, drive to drive
>> duplicating is quite expensive and tedious. I'm risking letting the
>> optical disks do that work for me for the next 20 years,..
>>
>>
>> >Amongst other advantages, when the time comes, copying stuff will
>> >simply involve a single "drag'n'drop" type operation on my computer, w=
hich
>> >should be MUCH easier than copying loads of DVDs one by one...
>>
>> For sure! As of this month, I've started keeping the field recording
> > originals on 1TB drives too for this reason. Rob D.
>>
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