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I thought maybe DNGs were better, more compact yet preserving all necessary info... I really have no idea what they are to be honest!

Alison,

 

Perhaps the question you need to answer is: "Will I be able to open my raw files in 20 or 30 years time when software that will read these particular raw file formats is no longer available?"

 

The DNG format is intended to be an open source, universal, digital negative standard that will stand the test of time by virtue of its widespread support. A number of earlier raw formats have already been superseded so, as time inexorably passes, it will become more difficult to obtain software that will read and convert them.

 

So, for example, if your raw conversion software was to become corrupted you may not be able to find replacement software to convert your raw files to a format that image processing software can work with. The DNG format is intended to be less likely to suffer from this.

 

Pete.

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You need a lot of DVDs though, Guy.

 

I backed up a years worth of DMR shots to DVD a couple of weekends ago. I needed 35...

 

Bearing in mind one DVD will only take 2x 2gig SD cards, you need a lot to keep up with things.

 

I agree, Andy. But DVDs are cheap and not subject to instant death, as hard drives are. In my experience, all hard drives will crash, sooner or later. If the damaged sectors are in the boot sector or in the drive allocation table, the whole drive goes :eek: . And this is likely to be where the damage will be, as those are the most frequently accessed and rewritten sectors!

 

Any and all archives have to be actively maintained. I expect to have to reduplicate these archived DVDs in ten years or so. And, Pete, that may be when I may have to change the format of the files to what will be the current norm for the software of the future.

 

Guy

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I spent some time in the squirrel house and thankfully I did not have the need for one of these for my collection

.

.

horse.jpg

 

Unbelievable you would reject this. Expression is PRICELESS (on the horse too)

 

rare mongolian saddle, wanted for a 1892 patent application I hear.

 

you never know

 

it aint over till it over

 

(or in McLean Va where they want to put in a tunnel for rapid transit

 

"It ain't over till its UNDER!"

 

:-)

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Interesting point about the longevity of the DNG format vs the RAW. I had wondered about this myself. Now I'm having second thoughts.... Hmmm.....

 

P.S. If I export the sidecar XMP files alongside the RAWs to preserve keywords, what happens to them during the Lightroom import—does Lightroom copy and preserve each sidecar file? Or does it just copy the info from it?

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