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Hoping to get some help on this. I'm running Lion 10.7 on a Macbook unibody A1278 - I want to upgrade my 250GB HDD to a 1TB. I plugged in the 1TB using SATA-USB cables, formatted it and installed Lion.

I removed the 250GB and replaced it with the 1tb only to end up with the flashing folder with a question mark. I switched the drives back and plugged in again using SATA-USB and the 1TB seems fine!

My question is - why won't my computer recognize the new drive when plugged internally? When using the SATA-USB, I'm able to browse Lion on the 1TB just fine. I verified the new drive using disk utility and it says it's OK.

I know that a simple solution would be to reformat the drive, plug in internally and reinstall Lion that way, but I would really like to know why this way did not work.

Any help on this would be greatly appreciated.

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— how was the drive formatted and partitioned? and what do you see when you go into System Preferences > Startup Disk? If you can post screen captures that might help as well. – l'L'l Jul 22 '12 at 21:13

It's the cable that needs to be replaced. Your drive definitely works fine.

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – ChrisF Sep 16 '13 at 20:14

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