WD 1TB external Hard Drive passport not available...

I have a WD 1TB external hard drive and when i plug in the device into my mac book pro it appears as if it is connected but the passport does not display anywhere on my computer. When i try to eject the WD it goes away for a second and comes back up that it is still connected. I do know i have zero space on my external hard dive but i just don't understand how early today it was working and now it can't be found.
Since i have used my external hard dive as my main source for time machine...will i still be able to retrieve my documents, pictures and videos if my hard drive is corrupt? has anyone had this problem before? If so, any suggestions? Thank you!

Unfortuanately WD external HD's have a pretty bad reputation with Macs. It has something to do with their enclosures as their internal HD's seem to work just fine. I would recommend exchanging that drive for one with a higher quality enclose. Just about any other manufacturer would be fine however the 3 best IMHO are:
OWC Mercury Elite Pro series
Lacie Quadra d2 series
G-Tech G-Drive series
All have similar features and build quality. I would be comfortable using any of the three but I've been successfully been using the Lacie's for 3+ years.
Roger

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