I have a 1TB WD external hard disk, which suddenly cannot be detected in my system. When i connect the hardisk to the macbook, the disk appears and immediately disconnects with the message "Disk not properly ejected". Any advice ?

I have a 1TB WD external hard disk, which suddenly cannot be detected in my system. When i connect the hardisk to the macbook, the disk appears and immediately disconnects with the message "Disk not properly ejected". Any advice ?

verify on another Mac if the same
WD is having issues with mavericks as you can see on the WD forum, did you install any WD software (never do that) when you connected the drive for the first time?
possible issue is a dead SATA bridge card or the new WD firmware w/ Mavericks.
SATA card issue
Your dead external hard drive is likely fine! Great hope for your 'faulty' external HD
http://community.wd.com/t5/External-Drives-for-Mac/bd-p/passport_mac
verify on another Mac if all possible

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