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Should I replace my MacBook Air hard drive, and how do I do that?

I’ve had a mid-2012 Macbook Air 13" (A1466) since 2013, and it’s finally giving way. Here’s what’s happening to it:

  • It's slow. It's very slow. It stops 3/4ths of the way in the loading screen, it takes 30 mins to boot up, and even after it's booted up, applications take ages to load and the cursor lags hard. Typing takes a while too. More than half of its RAM is empty, trash is empty. Did Apple diagnostics and EFI/Drivers/TestSupport.efi can't be loaded. So I'm guessing it's a Hard drive failure.
  • The battery appears as an "X" and won't last a second without a charger plugged into it.

I'd like some following advice on the questions below:

  • From what brands should I purchase the batteries and harddrives from? I really don't want any leaks or components that don't last long.
  • In terms of harddrive, I'm thinking of getting a 250 GB SSD and a SATA cable, am I on the right track?

Thank you very much. Any help would be very much appreciated.

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First off, see if it is actually your SSD that is slow. Install Blackmagic Disk Speed test to see how your drive is going(speed wise). If your drive ends up being very slow(compared to what it is supposed to be), try erase your drive completely(make sure to backup all the files you need). Then reinstall MacOS and try run Blackmagic Disk Speed test again, if it has become faster you are good to go. If it is still very slow in the test, then consider switching out the SSD. The MacBook Air you linked does not use a SATA SSD(as far as I know), it uses a custom Apple SSD(Not m2, there are adapters, but they can be unreliable). Consider following this guide to replace it, and if you really want a reliable drive option, purchase the drives that IFixit recommend.

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Apple SSD's are not M.2 complaint!

Here's more on the custom Apple SSD's: The Ultimate Guide to Apple’s Proprietary SSDs

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@danj Thanks for noting this, I fixed the wording to make it more clear that m2 are not Apple ssds.

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@Salar Sheriff - Just keeping you honest ;-}

FYI: This series SSD's use mSATA services over the custom interface.

An over full SSD will encounter issues as the wear living logic can get ham strung trying to move data around slowing things down.

Reformatting is a great way to regain performance, but you also don't want to over fill the drive! Leave 1/3 to 1/4 of the drive unused. That way the OS and the housekeeping tasks have the elbow room to do their work!

If you need more space then get a larger SSD, sadly 960 GB (1TB raw) is the largest Apple produced and what many 3rd party suppliers offer.

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