Both boot into the MemTest86 utility which is my goal but I first didn't expect the partition layout that I got and I can't figure out why I get 2 boot icons to select from. When I boot the system into the Startup Manager there are 2 extra drives to boot from, both named "efi boot", all lower case. Now, although, this isn't what I expected it does sort of work. It is now named Untitled and it is a FAT16 partition. The data is written to the first partition which used to be the EFI partition. Now, the file does end up on the usb drive but. Sudo dd if='//Volumes/Mac Mini Backup/Archives/MemTest86 Pro/memtest86-pro-usb/memtest86-pro-usb.img' of=/dev/disk3 bs=1m To copy the img to the disk i first unmount the partitions on disk3 This gives me what I would expect, the first partition is an EFI partition of size 209.7MB and the remaining 3.6GB, on a 4GB drive, being allocated to the second partition, /dev/disk3s2, MemTest86. I first partitioned the drive using:ĭiskutil partitionDisk /dev/disk4 1 GPT "HFS+" "MemTest86" 100% I am creating a bootable usb for MemTest86. I have had some success but not exactly what I wanted or expected. I am trying to create a bootable usb drive using diskutil and dd.
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