In this case, you can use the Restore feature in Disk Utility to transfer the files to another drive, as guided below. You can do this by dragging and dropping.īut you may fail to copy the files from a Time Machine backup disk this way, as many have reported. ![]() Since erasing the disk will delete all data on it, it's essential to secure the critical files to another storage device beforehand. If the first solution doesn't work, you can enable the "Partition" button on Mac by erasing the whole disk with GUID Partition Map. Way 2: Erase the offending disk with GUID Partition Map If the external hard drive won't partition on Mac, move on to the solutions below. This way, the disk will show up, and you can select it to check whether the Partition button works now. To do this, open Disk Utility, click the View icon at the top left, and choose "Show All Devices." The first thing you should try is to select the disk to partition. Usually, there are two ways to fix the "Partition" button greyed out on Mac when modifying an SD card/USB drive/hard drive.
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