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I have taken a 250G hard drive from my MacBook pro and cloned it sector-by-sector (using Acronis True image; which would be equivalent to running something like dd if=/dev/sda of=/dev/sdb) onto a larger 1TB drive.

The system boots as expected, but the OS still thinks the drive is 250GB. It looks as if it though the physical drive was 250GB and not just the partition, but I could be wrong.

How would I get OSX to recognize the full size of the 1TB drive?

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Might want to give this a try: Resizing HFS+ Partitions, haven't tested this on a MBP but it should work just fine.

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