I just got Dimenssion Strings and while trying to install I receive a notice "not writable drive. My computer and all three external drives were considered "non writable".
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Not writable drives
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"Nonwritable" Drives usually just means that they're read only.
You didn't list system specs. Are you on a Mac? I had this problem with a Mac that I use for film editing and this link helped:
http://www.cnet.com/news/solving-read-only-conditions-for-external-hard-drives/
Can you write anything else on the drives, like documents, or pictures, videos?