External disk ejected not properly during backup

Hi,
I'm running OS X Yosemite in my Macbook pro. I have an external backup disk made by Seagate. I have been using this disk for backup for probably 2 years with no issue. Today, I inserted the disk and saw it got mounted, and then I started a backup. After a while, a message popped up: Disk not properly. But I didn't even touch anything (the macbook pro and the external disk.) And afterward, the macbook pro will no longer mount the disk. I tried rebooted the macbook pro a few times and to no avail. Any one know what's the cause and how to fix ti?
Thanks

Either the enclosure has failed or the HD itself has failed.
If you have another enclosure swap it out and test.
http://eshop.macsales.com/shop/firewire/

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