A common problem in this series is the HD SATA cable tends to breakdown. When you put in a faster drive like a SSD it tends to show up. Follow this IFIXIT guide: [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Early+2011+Hard+Drive+Cable+Replacement/5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement] and you'll need this part: https://www.ifixit.com/Store/Parts/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041-2|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable]
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A common problem in this series is the HD SATA cable tends to breakdown. When you put in a faster drive like a SSD it tends to show up. Follow this IFIXIT guide: [guide|5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement] and you'll need this part: [https://www.ifixit.com/Store/Parts/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041-2|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable]
You should also make sure your systems firmware is up to date. Follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers] make sure your is at this level or newer.
A common problem in this series is the HD SATA cable tends to breakdown. When you put in a faster drive like a SSD it tends to show up. Follow this IFIXIT guide: [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Early+2011+Hard+Drive+Cable+Replacement/5120|MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement] and you'll need this part: https://www.ifixit.com/Store/Parts/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041-2|MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable]
You should also make sure your systems firmware is up to date. Follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers] make sure your is at this level or newer.
OK lets first look at your systems specs: [http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-2-duo-2.66-aluminum-13-mid-2010-unibody-specs.html|MacBook Pro 13" 2.66 GHz Core 2 Duo (Mid-2010)] and now lets look at the specs of the SSD you put in: [http://ap.apacer.com/products/specification/Solid-State-Drive-Thundebird-AST680S|Apacer AST680S]. Note the fact your systems HD SATA port is only SATA II (3.0 Gb/s) whereas your SSD is spec'ed as a SATA III (6.0 Gb/s) device. To start with your SSD is not compatible with your system! You'll need to return it and get a SSD which is able to run at SATA II. As an example if we look at the [http://www.samsung.com/semiconductor/minisite/ssd/product/consumer/750evo.html|Samsung 750 EVO SSD specs] we can see it supports multiple SATA interfaces (SATA I, II & III): "SATA 6Gb/s Interface, compatible with SATA 3Gb/s & SATA 1.5Gb/s interface" While yours does not!
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=== Update (08/05/2016) ===
You should also make sure your systems firmware is up to date. Follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers] make sure your is at this level or newer.
OK lets first look at your systems specs: [http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-2-duo-2.66-aluminum-13-mid-2010-unibody-specs.html|MacBook Pro 13" 2.66 GHz Core 2 Duo (Mid-2010)] and now lets look at the specs of the SSD you put in: [http://ap.apacer.com/products/specification/Solid-State-Drive-Thundebird-AST680S|Apacer AST680S]. Note the fact your systems HD SATA port is only SATA II (3.0 Gb/s) whereas your SSD is spec'ed as a SATA III (6.0 Gb/s) device. To start with your SSD is not compatible with your system! You'll need to return it and get a SSD which is able to run at SATA II. As an example if we look at the [http://www.samsung.com/semiconductor/minisite/ssd/product/consumer/750evo.html|Samsung 750 EVO SSD specs] we can see it supports multiple SATA interfaces (SATA I, II & III): "SATA 6Gb/s Interface, compatible with SATA 3Gb/s & SATA 1.5Gb/s interface" While yours does not!
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=== Update (08/05/2016) ===
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You should also make sure your systems firmware is up to date. Follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers] make sure your is at this level or newer.
OK lets first look at your systems specs: [http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-2-duo-2.66-aluminum-13-mid-2010-unibody-specs.html|MacBook Pro 13" 2.66 GHz Core 2 Duo (Mid-2010)] and now lets look at the specs of the SSD you put in: [http://ap.apacer.com/products/specification/Solid-State-Drive-Thundebird-AST680S|Apacer AST680S]. Note the fact your systems HD SATA port is only SATA II (3.0 Gb/s) whereas your SSD is spec'ed as a SATA III (6.0 Gb/s) device. To start with your SSD is not compatible with your system! You'll need to return it and get a SSD which is able to run at SATA II. As an example if we look at the [http://www.samsung.com/semiconductor/minisite/ssd/product/consumer/750evo.html|Samsung 750 EVO SSD specs] we can see it supports multiple SATA interfaces (SATA I, II & III): "SATA 6Gb/s Interface, compatible with SATA 3Gb/s & SATA 1.5Gb/s interface" While yours does not!