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    1 PassMark ® Software MemTest86™
    2 Copyright (C) 2013-2022 PassMark Software
    3 All Rights Reserved
    4 http://www.memtest86.com
    5 
    6 Overview
    7 ========================================
    8 PassMark's MemTest86 is a standalone memory testing software for x86 and ARM computers.
    9 MemTest86 boots from a USB flash drive and tests the RAM in your computer for 
   10 faults using a series of comprehensive algorithms and test patterns.
   11 <For more details see the MemTest86 User Guide>
   12 
   13 
   14 Requirements
   15 ========================================
   16 - UEFI-capable x86 (x86/x64) or ARM64 (aarch64) compatible System (Mac and PC)
   17 - USB Flash drive (>= 512MB capacity)
   18 
   19 
   20 Creating a bootable USB drive
   21 ========================================
   22 
   23 For Windows:
   24 
   25  - Plug in your USB drive.
   26  - Launch the included ImageUSB application.
   27  - Select your USB drive from the list (Step 1).
   28  - Select 'Write image to USB drive' (Step 2)
   29  - If it is not already selected, select the included image file (Step 3).
   30  - Click 'Write' (Step 4).
   31 
   32 After accepting a few more prompts this should give you a working
   33 bootable USB drive.
   34 
   35 For Linux:
   36 
   37 1) Insert a USB drive into a USB slot.
   38 2) Determine which device the USB drive is assigned as (eg. /dev/sdc).
   39 3) As root, use the 'dd' command to write the image to the USB drive. For example,
   40 
   41 sudo dd if=memtest86-usb.img of=<dev>
   42 
   43 where <dev> is the device the USB key is assigned to. Use the base device (ie. /dev/sdc) not a partition designation (ie. /dev/sdc1).
   44 
   45 For Mac:
   46 
   47 1) Insert a USB drive into a USB slot.
   48 2) Determine which device the USB drive is assigned as by opening the Terminal and typing the following command:
   49  
   50 diskutil list
   51 
   52 3) Unmount all volumes on the USB drive by typing the following command: 
   53 
   54 diskutil unmountDisk [device name]
   55 
   56 4) As root, use the 'dd' command to write the image to the USB drive. For example,
   57 
   58 sudo dd if=memtest86-usb.img of=<dev>
   59 
   60 where <dev> is the device the USB key is assigned to. Use the base device (ie. /dev/disk1) not a partition designation (ie. /dev/disk1s1).
   61 
   62 Warning: all data on the USB key will be lost. 
   63 Warning Warning: Make sure that the device used in the dd command above
   64 is correct!!!
   65 
   66 
   67 Booting the MemTest86 USB drive
   68 ========================================
   69 To start MemTest86 insert the USB flash drive into the appropriate drive and 
   70 restart your computer. The UEFI BIOS must be configured to boot from the device 
   71 that MemTest86 is installed on. Most systems have an optional boot menu 
   72 that is enabled by pressing a key at startup (often ESC, F9, F11 or F12).
   73 
   74 If available use the boot menu to select the correct drive.
   75 Please consult your motherboard documentation for details.
   76 
   77 On a Mac, to boot from USB, you need to hold down the ALT / Option key on the Mac keyboard 
   78 while powering on the machine.
   79 
   80 On newer Macs (from 2018) with the Apple T2 Security Chip, you may need to change the SecureBoot settings
   81 for MemTest86 to boot. Please see the following page for instructions:
   82 https://support.apple.com/en-us/HT208330
   83 
   84 Reclaiming disk space from the USB drive
   85 ========================================
   86 You may have noticed that the MemTest86 USB drive you have created may have lost some 
   87 disk space and normal formatting will not recover the lost space. 
   88 For example, this can happen when a UFD contains multiple partitions, such as the
   89 MemTest86 image. Formatting will not span across multiple partitions/volume. 
   90 To erase the partition records and reclaim the whole disk, you will need to 
   91 zero the MBR.
   92 
   93 WARNING: THIS PROCESS WILL COMPLETELY DELETE THE DATA ON THE DRIVE
   94 
   95 For Windows:
   96 
   97 1. Insert UFD.
   98 2. Launch imageUSB and select the appropriate UFD. (Be careful and select the correct drive!).
   99 3. Choose the Zero UFD option & Run.
  100 4. Drive MBR is now Zeroed. You will need to reinsert the drive for Windows to recognize it 
  101    and prompt for formatting before you can use it again. A normal format will now recover 
  102    the full capacity of the USB drive.
  103 
  104 For Linux/Mac:
  105 
  106 1) Insert the USB drive into a USB slot.
  107 2) Determine which device the USB drive is assigned as (eg. /dev/sdc on Linux, /dev/disk1 on Mac).
  108 3) As root, use the 'dd' command to erase the partition table of the USB drive. For example,
  109 
  110 dd if=/dev/zero of=<dev> bs=512 count=1
  111 
  112 where <dev> is the device the USB key is assigned to. Use the base device (ie. /dev/sdc) not a partition designation (ie. /dev/sdc1).
  113 
  114 
  115 Documentation
  116 =============
  117 All the documentation is included in the MemTest86 User Guide PDF. It can be found under the
  118 'help' folder in the USB flash drive. 
  119 
  120 
  121 Support
  122 =======
  123 For technical support, questions, suggestions, please check the User Guide or 
  124 visit our web page at http://www.memtest86.com
  125 
  126 
  127 Ordering / Registration
  128 =======================
  129 All the details are in our sales information page
  130 http://www.memtest86.com/sales/index.php
  131 
  132 
  133 Enjoy..
  134 The PassMark Development team