I have an M500 960GB SSD that will not complete a clone without I/O failures. This is on a MacBook Pro running 10.8.5. It fails consistently with Disk Utility and SuperDuper. The source HD has been verified. The SSD is on an external USB connection. The original SSD failed completely at one point and was replaced by Crucial, but it has the same problem with I/O errors. The SSD has been given days for garbage collection with no improvement. The drive was purchased from an authorized distributor, but the 30 day return window has now expired while I've tried relentlessly to get it to work. Now I'm left with a $600 brick. Help!
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