I have an old Canon camera, model SD300, that I modified for taking
pictures in near IR and near UV. The largest capacity SD card it will
take is a 2GB.
I bought 2 cards and took a lot of pictures and they were all fine
when I looked at them later when I put the SD cards in my computer and
tablet. The cards have sat around for about a year and now most of the
pictures are corrupted. Fortunately I had saved the pictures I liked.
Is there something I could have done that caused this problem? I am
using micro SD cards in an adapter so they will fit the camera and my
tablets. Should I just use full size cards and only view the pictures
on my computer?
Thanks,
Eric


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Older SD cards suffered from deterioration, temperature sensitivity, moisture sensitivity, power spikes, power failure, and "simple" internal failure. Solutions include:

SD Monitoring software - It will check an SD, warn if there may be damage and can (sometimes) fix that damage. There are companies out there that will do the same thing if you send them the damaged card.

https://product.tdk.com/info/en/prod.../tdksmart.html One of several.

Shift to 'industrial' SD cards.

https://www.amazon.com/SanDisk-Endur.../dp/B00V5Q1K3O One of many options.

Peter Wieck
Melrose Park, PA

In article ,
says...

I have an old Canon camera, model SD300, that I modified for taking
pictures in near IR and near UV. The largest capacity SD card it will
take is a 2GB.
I bought 2 cards and took a lot of pictures and they were all fine
when I looked at them later when I put the SD cards in my computer and
tablet. The cards have sat around for about a year and now most of the
pictures are corrupted. Fortunately I had saved the pictures I liked.
Is there something I could have done that caused this problem? I am
using micro SD cards in an adapter so they will fit the camera and my
tablets. Should I just use full size cards and only view the pictures
on my computer?
Thanks,
Eric

You nay be able, if wished, to read full-size cards in a tablet by using
an OTG card reader quite cheaply.

Mike.

On Wednesday, August 26, 2020 at 9:36:52 AM UTC-7, wrote:
I have an old Canon camera, model SD300, that I modified for taking
pictures in near IR and near UV. The largest capacity SD card it will
take is a 2GB.
...The cards have sat around for about a year and now most of the
pictures are corrupted.

Age causes the charge to leak, and any 2G card is probably a decade old.
Good news: you can get a format utility from the SDcard consortium

https://www.sdcard.org/downloads/formatter/

and if you choose the 'overwrite' option, it completely initializes all the bits
instead of just directory twiddling.

The complete rewrite takes a while, of course, but it does get rid of weak bits,
and presumably that's what aging has done.