Yosemite is ejecting my external drive

[zamboknee]

An external hard drive I've been using for quite a while is being ejected automatically by my Macbook Pro.
I've used this hard drive for quite a while on this computer but over the last couple weeks it's been getting ejected for no discernible reason.
USB, Western Digital, 320 gb, a few years old.

 

[Fishrrman]

I'd try what the alert window is advising you to do:

1. Back up whatever's on the drive.
2. Re-initialize it -- I'd suggest HFS+
3. Re-test it using Disk Utility's "Repair Disk" feature.

What kind of report do you get then?

 

[Taz Mangus]

An external hard drive I've been using for quite a while is being ejected automatically by my Macbook Pro.
I've used this hard drive for quite a while on this computer but over the last couple weeks it's been getting ejected for no discernible reason.
USB, Western Digital, 320 gb, a few years old.

Do you have another Mac computer you can try the hard drive out in? Does the same issue happen if you use a different USB port.

 

[zamboknee]

Do you have another Mac computer you can try the hard drive out in? Does the same issue happen if you use a different USB port.

Looks like it was the cable. It was a longer cable I bought from Cablestogo