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Linux is preferable, but that would be nice if there's a Windows solution :)

I have two USB HDDs, and each has category folders: e.g. "Music" and "Video" - kinda archive. Later, when they're full, i will add more devices.

Is there a way to join the two dir trees (from different devices) into one virtual filesystem? So that i can access its root, and see all files joined into one tree?

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Are you looking to cluster them, or just have them mounted as different subdirectories? – Keith Jul 17 '09 at 18:43
Smth like clustering into one big virtual joined filesystem, that is called "union mount" – kolypto Jul 17 '09 at 19:34
up vote 2 down vote accepted

The UnionFS stuff might help

Some information here, it allows you to overlay multiple mounts and directories onto one another.

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That's it, thank you! Obvious FS name, really) – kolypto Jul 17 '09 at 18:33
No worries. It is actually pretty nifty. I use it sometimes for odd source-code management practice :) – Aiden Bell Jul 17 '09 at 19:01

Linux have this already. You can do e.g.

mount --bind /old/dir /new/dir

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