External hard drive is not opening ntfs for mac free. Create a bootable USB Flash drive: Download the Linux/Mac MemTest86 USB image. UN-tar the package (tar xvzf MemTest86-*-usb.tar.gz). An image file and a; README file will be created in the current directory. Follow instructions in the README to write the USB flash disk. Pretty generic. SystemRescueCD can be installed to USB, and includes memtest86+. Additionally, if you have Linux installed, you can run memtest86+ from Grub (boot it like a 16-bit Linux kernel with the linux16 command).
You can do it without imageUSB. From the memtest86 7.4 USB package readme file: WARNING: THIS PROCESS WILL COMPLETELY DELETE THE DATA ON THE DRIVE For Linux/Mac: 1) Insert the USB drive into a USB slot. 2) Determine which device the USB drive is assigned as (eg. /dev/sdc on Linux, /dev/disk1 on Mac).
3) As root, use the 'dd' command to erase the partition table of the USB drive. For example, dd if=/dev/zero of= bs=512 count=1 where is the device the USB key is assigned to. Use the base device (ie. /dev/sdc) not a partition designation (ie.
You can use blkid to find out the device name. Be absolutely sure to use the correct device name with dd. Access hard drive on mac. Format afterwards.