USB 3.0 drive won't boot
In the past I've regularly used SuperDuper! to clone my system drive to an external USB drive, of course formatted with "GUID Partition Scheme", and then successfully tested my backups by booting from it.
However I recently bought a new drive and despite "GUID"-formatting it prior to running SuperDuper!, it fails to boot - I get the broken folder icon and it boots from the primary drive instead.
The drive that fails to boot is a LaCie Rugged Mini 1.5 TB as shown here:
It's advertised as supporting USB 3.0 and USB 2.0, but it actually only has a USB 3.0 port, and comes with a USB 2.0 -> 3.0 adaptor cable. In theory, this should not matter since USB 3.0 is said to be backwards-compatible with USB 2.0.
The drives I've successfully used in the past were similar Lacie portable drives typically with USB 2.0 only.
The only obvious differences I can see with the newer LaCie Rugged Mini drive is the ports (USB 3.0 instead of USB 2.0), and the larger capacity (1.5 TB instead of 500 or 250 GB previously).
Any ideas why the new drive won't boot, or how I could diagnose why it isn't booting?
Has anyone else reported their experience with USB 3.0 drives, either positive or negative?
I'm running SuperDuper! version 2.6.4 (v89) on Snow Leopard 10.6.8.
Note that I can't currently upgrade to Lion because my Intel iMac is too old - it's a 2006-era 32-bit Core Duo, and the Lion minimum requirement is the Core 2 Duos that came out shortly after :-(
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