I found a very wet Transcend Portable 4gb Drive on Meall a'Chochuill last Saturday.
Remarkably after drying it out it works and there are lots of photos on it mainly of the same couple walking hills in winter, and some summer ones as well.
Let me know if you think it is yours and I will send it to you. I have a question that will verify your claim.
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Have you lost or found some gear when out in the hills?