Why doesn't my macbook air recognise my external seagate drive, why doesn't my macbook air recognise my external seagate drive

I used to be able to use Time Machine with my Seagate but all of a sudden it has stopped working and doesn't recognise the external drive anymore.

1. never ever have a single choke point of data failure as a single ext. hard drive.  always 2 copies off-computer at all times minimum.
Methodology to protect your data. Backups vs. Archives. Long-term data protection
2.   DiskWarrior can repair hard drive issues that Disk Utiity can't.
http://www.alsoft.com/diskwarrior/
3. There are 2 possibilities fundamentally, SATA card failure (unlikely) in the ext. HD, or you corrupted the filesystem in yanking the HD while it was arranging itself (very likely).
youre not out of luck no.
Does the HD spin up at all  (listen closely) ? If it doesnt , its SATA card failure.
if it does its a corrupted file system from yanking the HD
FIRST try reconnecting the HD again a couple times, often this does in fact work.

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