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In the example above the device name is /dev/sdb Unmount all volumes on the USB drive by typing the following command: dev/sdb Lexar JumpDrive 15G disk AASNGKKA04EW2GXD dev/sda VMware, VMware_Virtual_S 80G disk Lsblk -p -o NAME,VENDOR,MODEL,SIZE,TYPE,SERIAL Double-check to make sure you have the correct drive. **WARNING** The contents will be overwritten in the next steps.ĭetermine which device the USB drive is assigned as by opening the Terminal and typing the following command. Insert a USB flash drive into a USB slot.

For the free edition of MemTest86, this file is called, memtest86-usb.img Inside the Zip there is a "disk image" file. Download the current Memtest86 package as a Zip file from this page.You can now quit Terminal and eject the volume.Creating a MemTest86 bootable USB Flash drive in Linux/Mac When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Monterey.After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.Terminal shows the progress as the volume is erased. When prompted, type Y to confirm that you want to erase the volume, then press Return.Terminal doesn't show any characters as you type. When prompted, type your administrator password.If the volume has a different name, replace MyVolume in the command with the name of your volume. Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Type or paste one of the commands below into Terminal, then press Return to enter the command.Open Terminal, which is in the Utilities folder of your Applications folder.Plug in the USB flash drive or other volume that you're using for the bootable installer.