Esternal drive HD WD 3T My Passport with Mavericks suddenly unmount

I've a problem with my external HD WD 3T with my mac with Mavericks. When my HD is linked to my macbook air and I work with him (view foto, copy and cut file, open file) suddenly the HD unmount from my mac.
I tried to exclude my HD from Spotlight search but the problem persists.
I've scary because I might miss all my works and all my files.
Who can help me??? Please!!!
Thank you!

Take the WD HDD out of the enclosure and install it in another enclosure, preferably a non WD one.  See if it is recognized then.
Ciao.

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