My Seagate external 250GB hard drive ejects improperly without command. I am trying to use Time Machine to backup my macbook via usb cable... I keep getting the message that the disked ejected improperly... Any solutions...

You are not alone. Thousands have this problem, on various models of Macs. Short answer, it has something to do with the disk going to sleep (possibly?). You can't do anything about it and Apple won't address the problem. Maybe you should buy a time capsule. Just keep giving them money and use their proprietary equipment.
For a more complete answer, see this thread (all 65+ pages of it with NO SOLUTION IN SIGHT... except for some 3rd party solutions that sometimes work, sometimes don't): Disk Drive ejecting itself

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Choose Connect to Server from the Finder's Go menu, provide the first computer's IP address, log in, and set it up in the Time Machine pane of System Preferences.
(59008)

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Hi all.
I just bought a T1B Intenso Hard Drive.
Plugged into my MacBook Pro and TimeMachine instantly pops up asking me if i want to back up.
I do, so I accept and encrypt it.
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My Seagate external 250GB hard drive ejects improperly without command. I am trying to use Time Machine to backup my macbook via usb cable... I keep getting the message that the disked ejected improperly... Any solutions...

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