You write zeros over the sectors on those platters to overwrite any data that's there. I hope these tips help you get your Mac up and running without the quirks that sometimes arise.Writing zeros needs to be done on magnetic media such as a drive with spinning platters. This is the advantage of Apple making both the hardware and the software. (SMC doesn’t exist on M1 Macs.) When an M1 Mac reboots, it runs a sequence to make sure the NVRAM is doing what it should do. If you have an M1 Mac, you should know that they don’t need to have NVRAM cleared or the SMC rebooted. You can check out this technique in this video.
Wait 15 seconds with the Mac unplugged.
Connect your power adapter to your Mac and to a power source.The process is slightly different for different types of Mac. Apple recommends resetting it to fix issues with power, battery, fans, and other features. Resetting the SMC is a similar operation to resetting the NVRAM. The SMC is the system management controller. You’ll want to listen for the Apple “chime” twice. You can check out the technique in this video. To reset PRAM/NVRAM, restart your Mac, and press and hold the following key combo: Option + Command + P + R. Both PRAM and NVRAM are reset the same way. Resetting the PRAM or NVRAM can sometimes remedy strange bugs. Apple keeps things like the display resolution, volume, and startup disk location in this portion of your system memory. Newer Intel Macs use NVRAM (non-volatile random–access memory) for the same purpose. PRAM stands for “parameter random-access memory.” This is the portion of the system memory that holds a small number of settings that the system can access quickly. We’re going to dive into a few techniques that you can use to get your Mac back up to speed. Strange behaviors, sluggish performance, and stuck settings can become frustrating in no time flat. But sometimes, even Apple’s best machines can run into trouble. Even while your Mac is sleeping it is actually performing maintenance and keeping your machine in tip-top shape. One of the main reasons that people use Macs is that they are reliable.
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