This could and often did lead to corruption of the partitions stored on a drive. Instead a a pure GPT scheme is employed. One would think this would negate The Golden Rule , but for a different reason, this rule lived on. This reason has to do with bugs introduced by the installation of Apple's Windows Support Software.
Since the Windows software can now read these partitions, the software believes the partitions are Microsoft type partitions. When running Windows partitioning software, this can cause many possible side-effects. So it seemed, The Golden Rule still applied. Recently, cases have been found where The Golden Rule can be broken.
Format Your Drive With Disk Utility
In other words, there are cases where the diskpart command can be used to edit a drive partition table when a pure GPT scheme is employed. One such case is when the Windows Recovery Environment is used. This environment can be entered by holding down the shift key while selecting to restart Windows.
When you navigate to a Command Prompt window, you can access the diskpart command. This command, when entered here, is unaffected by the Apple's Windows Support Software. Basically, the Windows Recovery Environment loads the Winre. This image file contains a copy of the diskpart command which can be executed safely. I previously formatted my drive on Linux and then on Windows. Guess Windows did not write the partition type.
Guide: Formatting a USB Flash Drive for Mac & PC Compatibility
Let's do it for her on MacOS. First let's find out how our GPT table's laid out:.
Linux Filesystem Data. There are 3 numbers to take note of from the output.
How to Check a Drive’s File System
What the numbers are depends on what was printed on your terminal. Do not copy mine. Do not lose them until you're done. First remove the wrong partition. It does not remove our actual data. In this command we use the number index , in my case 1 :.
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And then we add the correct partition. In this command we use all the 3 numbers: start , size and index. In my case they are , and 1. Replace with yours where appropriate. Listen now. Home Questions Tags Users Unanswered. Ask Question. Asked 1 year, 10 months ago. Active 4 months ago. Viewed 13k times. Arne Burmeister.
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Arne Burmeister Arne Burmeister 1 1 gold badge 8 8 silver badges 19 19 bronze badges. This is why the Mac tries to mount it as HFS and fails. Can you check on your Windows machine if it displays the same in the partition table? But I can check the windows info when I have access to tomorrow.
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The formatting and mounting only takes place at the partition level. The partitioning table is stored at the disk level instead. Might it be that you've created the partiton table on a Mac, and then later chose to reformat a single partition on a Windows PC to use there? Use a partition editor - I cannot remember if diskmgtmt. If not, you can most probably download a more advanced partition editor for free. Using an external drive between Mac and Windows computers can be a hassle, since you constantly have to reformat it to fit which computer you're using it on. Instead of reformatting it all the time, just use the much more platform-independent exFAT and never format it again.
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You can always install drivers for those other OSes , but that doesn't help when you're sharing files with your friends' computers. Besides, it's kind of a hassle. The exFAT file system is a much simpler option. Essentially, it's a file system that's both readable and writable on any modern Mac or Windows machine sorry, Leopard users. All you need to do is format the drive on a Windows machine and you're good to go.