![]() Open the startup disk pref pane and set the SSD to be the new boot drive Do you get a good boot? Can you log in to the finder? Select the newly-installed drive (should be the only icon) and hit return. Press the power on button and again IMMEDIATELY hold down the option key to invoke the startup manager again. Now it's time to "test the installation" I'd suggest you put just 4-5 screws in the back for now to "tack it in place" Now put the SSD and ribbon cable back into place Use the TORX driver to remove these, and put them on the sides of the SSD On the side of the drive, you'll see 4 "bosses" sticking out. DO NOT use anything "metal" to lift the cable from the motherboard connection !!! If you're going to replace the cable, now's the time to do it. Gently lift the drive out and remove it from the cable. If so, get to the finder and "look around". Do you see the SSD in startup manager? If so, click on it with the pointer and hit return IMMEDIATELY hold down the option key and KEEP HOLDING IT DOWN until the startup manager appears. When the clone is done, now it's time to TEST IT. If CCC asks if you wish to clone the recovery partition, YES, do this too. Don't worry about the box on the right (scheduling) In the middle one, select the SSD in the external enclosure (your target) In the left one, select the MBP internal drive (your "source") Click through the initial stuff to get to the "main screen". You want "APFS with GUID partition format". Put the SSD into the enclosure (for now). A Phillips #00 driver and a TORX T-6 driver (cheap and easily found in hardware stores or online)ĬCC is FREE to download and use for 30 days. Replacing the drive is an easy procedure that ANYONE can do. You can use the old drive (which by then will be in the enclosure) when you setup the clean install (using setup assistant). ![]() ![]() If that doesn't work, just erase the drive and start over. It could be the ribbon cable (see above), or the drive is fragmented, etc. ![]() I suggest you clone the contents of your existing drive to the new SSD below.Ĭhances are, it's not the software on the HDD that's slowing you down. OK, now let's get on with drive replacement. You might want to order a new cable along with the stuff below. Go to to see the details on how to replace it and the drive. But in truth, the drive can be good, it's the CABLE that is flaking out.Ī replacement cable is a cheap part. To the user, this seems like "the drive has failed". When that happens, communication gets lost/interrupted between the drive and the motherboard. I also think it might be the hard drive ribbon cable, which tends to fail in this model.īefore going further, be aware that the 2012 MBP can have problems with the drive ribbon cable. utilization which leads me to suspect it is a problem at the system or OS level rather than at the application level (otherwise it should show the CPU and/or other resources pegged at a high utilization). The system resource monitor shows only a tiny bit of CPU, memory, disk, network, etc. So there seems to be plenty of drive space and memory. It has a 500GB HDD and only 100GB is used so far. It has 4GB RAM and the system resource monitor shows there is more than 1G RAM free while using all the apps (in any case, I will be upgrading to 16GB at the same time). Recovery mode? My guess would be that creating bootable media would ensure that no corruption is copied over in case the Recovery image is corrupt? (If it is even possible for the OS image to be corrupt and still run ok but slow, I'm not sure). Would there be any difference (besides convenience), when using the bootable MacOS Installer vs. I am not sure if using Time Machine restore will also possible copy a corrupted state back onto the system, or if this just involves user data, since the guides talk about how Time Machine will also recover the OS. I am not sure which method is best to ensure that I have a clean install when I suspect OS corruption. I am confused because all these guides seem to be for the same result (fresh re-installation of the OS) but totally different methods. Other posts emphasize to boot into regular Recovery mode instead of Internet Recovery mode. Other posts talk about the very simple process of booting into Recovery mode, using the disk utility, and then performing the installation (or Time Machine restore). Some posts first recommend downloading the OS from Apple and installing onto the new SSD when the SSD is connected as an external drive, before installing in the computer. I plan to use Time Machine to first backup the user files onto an external USB drive. I have a mid 2012 MacBook Pro (A1278) with 10.15 Catalina and it's running extremely slow despite every troubleshooting step, so I want to do a clean install of the OS (in case there is OS corruption) while upgrading the HDD to an SSD drive.
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