Balena etcher clone drive10/19/2023 ![]() On a terminal, run sudo diskutil list to see the drive path. Once testdisk is installed, plug in the drive to your MacOS machine and if MacOS suggests formatting the drive, select ignore. You may be able to install testdisk using homebrew: brew install testdisk You can also try using testdisk on your macOS to see if it can recover your partitions in your external drive. You should now see a new “drive” on your desktop, this is your partition. That’s the easy part: hdiutil attach copy.img ![]() Now you should have a copy of the raw partition as copy.img in your home folder. This is the most important part, you need to adapt it according to the partition offset you’ve found in step1. skip=1: tells dd to skip one block at the beginning (which size is defined by bs= above) because out partition starts at 1MiB. ![]() bs=1048576: tells dd to copy 1MiB sized blocks./dev/rdisk2: the disk from the steps above, rdisk instead of disk will copy faster.So 0x00100000 = 1048576 = 1MiB Step 2: Backup the partitionĬopy the raw partition to a disk image with sudo dd if=/dev/rdisk2 of=copy.img bs=1048576 skip=1 (replace rdisk2 with the number of the disk from the previous steps and note the r before disk), this will take some time depending on the size of the drive. We don’t really care what type of partition (fat32 or ntfs) it is, what we need is the offset: the number in the first column, 00100000 in both cases above. X.MSDOS5 on the third line of the output, this is a FAT32 partition starting at 0x00100000 bytes (the number in the first column of the third line) = 1048576 bytes = 1MiB. run sudo hexdump -C -s 512 /dev/disk2 | head which will show you the contents of the beginning of the disk (skipping the first 512 bytes).I will use /dev/disk2 in the commands below, please use the correct disk number from the previous step.run diskutil list again, a new drive should have appeared, note its name (something like /dev/disk2).connect the drive to your mac, if macOS tells you something like “this drive is not readable on this computer”, select “ ignore”, DO NOT SELECT FORMAT.before connecting the drive, open a terminal on your mac and type diskutil list. ![]() ![]() In order to recover data (on a mac): Step 1: Find the offset of the partition If the drive was readable on Windows 7, I guess the partition is either fat32 or ntfs.ĭo not format this drive if any system asks you to ! The partition table is missing on that drive, so we need to find where the partition is. I’ll assume that there was only one partition and that you have enough disk space on your mac to make a disk image of this drive. Hello you know how many partitions were on the drive ? ![]()
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