external drive unmounts when I try to repair

[4now]

I am trying to verify and repair and external lacie hard drive. And when I do it suddenly unmounts. Then I have to disconnect & re-connect the usb cable for it to mount again.

The files are on the external and still accessible.

 

[misterredman]

I am trying to verify and repair and external lacie hard drive. And when I do it suddenly unmounts. Then I have to disconnect & re-connect the usb cable for it to mount again.

The files are on the external and still accessible.

I think it's normal for Disk Utility to unmount the drive before repairing it. Does the repairing finish with success or do you get an error?

 

[4now]

There was an error before the repair (don't remember the specifics.. I'm away from the machine)