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13" aluminum unibody, 2.0 or 2.4 GHz Core 2 Duo processor.

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Why will only the original hdd work in my MacBook?

I have a late 2008 aluminum MacBook. The hard drive was failing so I bought a replacement and cloned the original.

Before I put it in I made sure it was working with a SATA to USB adapter. However, when I put it in it gave me the flashing question mark, so I made sure again that it worked externally and it did.

Here is where it gets funky, I think oh crap I broke the cable but before I go a buy a new one I'll put the original hard drive in and it boots up fine. So the new hard drive works fine but won't read internally. And I know its not the Mac because as I said the original still works in it. (On phone so I apologize for grammar)

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Be careful here! Your system was designed to support a SATA II (3.0 Gb/s) drive. Newer drives are mostly SATA III (6.0 Gb/s) only (fixed speed)! Some drives offer support of the slower SATA specs we call these Auto Sense as they match the systems I/O speed. As an example this drive: Samsung 860 EVO SSD is one of the few which supports SATA II (3.0 Gb/s) systems.

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If you have the proper drive then you should only need to alter it to be your boot drive. With the new drive installed reboot your system and press the Option (⌥)  key which allows you to gain access to the startup manager so you can select your new drive to boot up from. Now go into your Systems Preferences settings Startup Disk and set it as your boot drive and restarting. That should do it.

Reference: Mac startup key combinations

I really don’t recommend cloning any more. It was fine with older OS-X releases like Lion (as long as you didn’t have any corruptions in the drive), but todays OS’s are very different! I haven’t used any cloning software for systems drives for quite a few years. Instead I use Apples supplied tools TimeMachine & Migration Assistant (which fires off at the end of the OS installer.

Remember you carry over all of the junk your system has built up over the years. Doing a fresh OS install and the migrating your stuff over is the only real way to shed-off all of the junk.

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It doesn't appear in the startup chooser, also something weird, when I have the new drive plugged in internally and the old drive externally neither of them appear. And this is el capitan not something like Mojave or catalina.

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I would setup an USB OS installer drive reformat the new drive and install a fresh copy of your OS, Then use Migration Assistant to move your user accounts, apps & data over to the new drive from your older one.

Getting a fresh OS installer for El Capitan is needed here access it via How to get old versions of macOS then follow this guide How to make a bootable OS X 10.11 El Capitan installer drive As to why you need a new copy reference this If you've got an old macOS install image, it will probably stop working today

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Zach peck sarà eternamente grato.
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