Self-booting off USB or Network (PXE)* boot, without needing DOS, Linux nor Windows.All RAM types supported (DDR2, DDR3, DDR4, DDR5, SODIMM, XMP, ECC). 13 different RAM testing algorithms - including row hammer fault detection*.MemTest86 supports all current technologies: The version of Windows, Linux, or Mac used on your machine is irrelevant for execution. MemTest86 does not require any operating system for execution. If your RAM is bad from a memtest, you should first update your motherboard's BIOS or consider buying new RAM. Memtest86 only detects physical errors in your system memory, but cannot fix any errors. You can read a description of each of the test sections here. MemTest86 executes a series of numbered test sections to check for errors and there should be 0 errors. How many errors in Memtest86 are acceptable? Memtest86 will load your CPU up to 100% during testing, because data read or written to RAM will pass through the CPU, but it should not harm your processor or RAM. MemTest86 boots from a USB flash drive and tests the RAM in your computer for faults using a series of comprehensive algorithms and test patterns. When the new owner starts up the Mac, they can use their own information to complete setup.No, MemTest86 is a memory-only testing tool for x86 and Arm PCs. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the setup assistant without completing setup, then click Shut Down. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.Īfter installation is complete, your Mac might restart to a setup assistant. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions.When you see a window with the option to reinstall macOS, your Mac has started up from Recovery.
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