A very common problem in this series is a bad SATA cable. Follow this IFIXIT guide: [guide|5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement]. You'll want to get the newer version of the cable [product|IF163-041|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N: 923-0104].
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A very common problem in this series is a bad SATA cable. Follow this IFIXIT guide: [guide|5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement]. You'll want to get the newer version of the cable [product|IF163-041|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N: 923-0104].
I hope you have a good backup of your Apps & data!
Hopefully your drive is still OK. You should get a SATA to USB adapter cable (or an external case to hold your drive) so you can test it out on another Mac system. Delete the partitions and reformat the drive. Then re-install the OS from the other system to make sure the drive is OK.
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Sometimes when the cable goes bad it damages the drive.
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Sometimes when the cable goes bad it damages the drive.
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=== Update (01/17/2016) ===
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Lets try doing a SMC reset to make sure the system knows whats up here. Follow this Apple T/N: [https://support.apple.com/en-us/HT201295|Resetting the System Management Controller (SMC) on your Mac]. Maybe its confused ;-}
A very common problem in this series is a bad SATA cable. Follow this IFIXIT guide: [guide|5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement]. You'll want to get the newer version of the cable [product|IF163-041|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N: 923-0104]
+
A very common problem in this series is a bad SATA cable. Follow this IFIXIT guide: [guide|5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement]. You'll want to get the newer version of the cable [product|IF163-041|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N: 923-0104].
+
+
I hope you have a good backup of your Apps & data!
+
+
Hopefully your drive is still OK. You should get a SATA to USB adapter cable (or an external case to hold your drive) so you can test it out on another Mac system. Delete the partitions and reformat the drive. Then re-install the OS from the other system to make sure the drive is OK.
+
+
Sometimes when the cable goes bad it damages the drive.
A very common problem in this series is a bad SATA cable. Follow this IFIXIT guide: [guide|5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement]. You'll want to get the newer version of the cable [product|IF163-041|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N: 923-0104]