Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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My hard drive doesn't gets recognized even though it works.

My macbook pro doesn't recognize my HDD anymore, even though it works when plugged in though USB.

I followed the instructions on here and got myself an SSD and a bootable USB. At first, it wouldn't let me partition the SSD with it plugged in internally. So I partitioned it with another laptop and put it back in. Now the computer recognizes the SSD, but it wont install the OS.

What can I do about this? Would this be a cable problem even though it recognizes the SSD?

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Try another hard drive cable. It's very common for the cable to go bad.


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What system are you trying to install? If is Sierra, your 2009 machine will not take it. Try El Capitan.

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It was yosemite.


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You could be facing two different issues here depending on which device you are using.

Let's start off with the SATA cable they do go bad which could explain why your original HD is not working. Here is the needed part: MacBook Pro 13" Unibody (Mid 2009/Mid 2010) Hard Drive Cable and here is the IFIXIT guide to replace it: MacBook Pro 13" Unibody Mid 2009 Hard Drive Cable Replacement

If you had replaced it with a newer drive you could also be facing a second issue here (as well as the SSD). You see, your system only has a SATA II (3.0 Gb/s) port and depending on your drive, you could be trying to use a FIXED SATA III (6.0 Gb/s) drive Vs one that is able to run at slower SATA II I/O speed (review the link posted above).

You'll need to review the drives specs sheets for the drives to see if they support multiple SATA speeds. For reference here's two drives which are able to run in your system:

Note the 'Interface' line on both of these, make sure your drives spec sheets are the same.

MacBook Pro 13" Unibody (Mid 2009-Mid 2010) Hard Drive Cable Imagem


MacBook Pro 13" Unibody (Mid 2009-Mid 2010) Hard Drive Cable


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@danj you beat me to it haha


I ordered the cable, I will keep y'all updated if I end up having any problems.


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It is a cable problem, these fail very easily in this model. Try a new cable, it should work then.

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@gigabit87898 - Sorry guy ;-}


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When you partitioned that new drive in the other System what OS was it? was it a Mac as well? Windows based machines will format depending on the size of the disk either NTFS (Natively non-writable for Macs) or FAT based (Fat/Fat32) Smaller drives and EXFAT for much larger drives. Fat based partitions are read/writable between Windows and Macs however Cannot maintain the OS for either system.

When using MacOS you should use the Disk Utility provided in either the Recovery Method or the Native OS to partition the drive to the Mac Formats (Journaled ..... ) to put a MacOS on it.

Another thing to mention if you can use the same cable on another OS and the drive works/partitions fine, it is highly possible the port you are connecting to is bad (USB) if you are trying internal cables and they arent working, you could have disconnected the cable from the Logic board it could have been damaged over time..

Try to single down where the issue is, using same cable on both machines does 1 work and the other doesnt? if i change ports on the machine it doesnt work on did it start working? etc... Once you can narrow down the issue it gets much easier..

1 More thing to mention some SSDs have firmwares associated to them, i would make sure that it has the latest available firmware attached to it as there have been known instances where the SSDs do not work well in macs without the firmware update.

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