IMac won't recognize usb 3 drive

Hi all,
I just purchased a Seagate "GoFlex Desk" 2 TB External Drive. It is recognized just fine in my MacBook Pro (Early 2011). When I plug it into my Intel iMac (2009?), it is not recognized. Both machines are running Lion. The box says the disk is "USB 3.0 + USB 2.0". I tried an iMac USB port that is functioning fine with another USB 2 drive. Anyone have any ideas why this won't work? Thanks in advance!
Paul

Same here. The Seagate 1TB 3.0 is not working properly with my Macbook Retina 2012. It will sync once and back up in time machine but then gets spotty - showing up only after a restart, then eventually just won't even show up at all. I've replaced it once through the on-line dealer, and had the same problem. The Retina has no problems reading anything - from old Western Digitals or my older Seagate 500 GB 2.0 from my iMac, but it looks like I'm going to have to find another brand if someone does not explain what is going on with the seagate line

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yes yes yes, I warn people about WD drives on this link:
Your dead external hard drive is likely fine! Great hope for your 'faulty' external HD
theReKleiner wrote:
What now?
Only option is to buy the SAME exact HD and swap controller boards, or pay someone a LOT more $$$ to do the same thing.
its not soldered there, its just a controller/ SATA "one piece"
They do that to save 50 cents in mfg. costs.
I mention your "issue" in that link. Which is why you do NOT buy WD ext. HD.
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However Toshiba didnt USED to do that, but they started doing it at the end of 2013.
avoid those 2.
To avoid that nonsense, buy Hitachi drives in USB.
Or, the best option:
Save money and invest in a bare hard drive backup and redundancy plan
Its cheaper
less fuss
more reiable, removes the nasty failure point of SATA card interfaces.
takes up lot less space.
Bare hard drives and docks. The most reliable and cheapest method of hard drive data storage, archives, and redundancies
The best method for your data archives and redundancies, which is also the least expensive, the most reliable, and the most compact option is the purchase of naked hard drives and at least one USB 3.0 HD dock ($40 roughly).
While regarding Time Machine and your Macbook or desktop, your primary backup is best saved to a conventional USB (or Firewire / thunderbolt) hard drive inside an enclosure, the most important part of your data protection begins after your 1st / primary Time Machine / backup; and these are your secondary (most important) data storage devices, archives and their redundancies.
However bare hard drives and docks (below) also work perfectly as a Time Machine backup, this is for home use, since the docking station is certainly not very portable as a notebook Time Machine backup device should be; nor should bare HD be packed around with a notebook, rather remain at home or office.
Six terabytes of 2.5" HD pictured below in a very compact space.
Bare hard drives and docks have the lowest cost, the highest reliability, and take up the smallest storage space
Drawbacks:
1. Care and knowledge in general handling of naked hard drives (how not to shock a bare HD, and how to hold them properly). Not a genuine drawback.
Advantages:
1. By far the least expensive method of mass HD storage on a personal basis. Highest quality naked HD can be purchased in bulk very cheap.
2. Eliminates the horrible failure point of SATA bridges and interfaces between external drives and the computer.
3. Per square foot you can store more terabytes of data this way than any other.
4. Fast, easy, no fuss and most simplex method of data storage on hard drives.

IMac won't recognize usb 3 drive

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