Re: What is this? (picture)
DDR can be desktop or laptop. Becasue of the size, that is desktop memory. To be very specific, it's a 256MB stick of PC-3200. I'm not sure how much they go for in shops now, if you can even find a stick that small.
As for things stored on them, anything that is put on RAM is only temporary. Anything that is stored in RAM gets lost every time the system shuts down/restarts. Assuming you have a computer that supports DDR, there is no reason that those sticks would not work.
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