What Disk Format For Mac Sierra

When talk about formatting external hard drive/USB flash drive in macOS 10.13 High Sierra, we should introduce Mac disk formatting software first. Unlike Windows system, macOS doesn’t offer quick format or high-level format function when you right-click the disk icon. How to Format an External Drive for Mac Compatibility. This is a simple procedure and is achieved the same way for all drive types and through all connections, be they USB, Firewire, or Thunderbolt. Formatting a drive will erase all data and partitions on the disk: Connect the hard drive or USB key to the Mac.

All external USB disks can be formatted to work on Mac OSX, but not always straight out of the box. In this tutorial we look at formatting disks via the GUI app called Disk Utility and its equivalent command line tool diskutil. This will work in all modern versions of Apple Mac OSX including 10.9 Mavericks, 10.8, 10.7 and 10.6. Initially external disks may be formatted for Windows and after you connect it to your Mac it appears in the device list in the Finder, but is a read only disk meaning that you can’t write to it in its current format. The when the disk is selected in the finder bottom left symbol with the crossed out pencil means that the disk can only be read not written to. Why this is, is because they come formatted as Windows NTFS drive which OSX can only read, so we need to reformat them so we can read and write – thats where a handy utility called Disk Utility comes to the rescue.

Disk Utility Disk Utility is found in /Applications/Utilities/Disk Utility.app, open it and select your external disk in the list on the left. There are 2 items (or more) for each disk, you have the actual disk and the volume of the disk, the example below has the Disk Named 2 TB WD Elements and the Volume is named Elements, this example uses the Volume which will in turn also format the Disk. Then below you will see the Format type which will be NTFS or possibly MS-DOS (FAT), we need to reformat the volume and make the format Mac OS Extended (Journaled).

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Reformatting the Disk Still with the external disk selected in Disk Utility go to the Erase tab, select Mac OS Extended (Journaled) from the format dropdown, choose to name the disk and then click Erase. And there you have it one read and writable disk ready for OSX.

The Security Options option next to erase can control how the disk is erased by zeroing out all the blocks on the disk, this then make it impossible to salvage any previous data, with new disks this is not necessary. Also the other format option Mac OS Extended (Case-sensitive, Journaled) in the dropdown would allow you have same name files or folders in the same location with a mix of case like ‘red’ and ‘RED’, this is popular in the Linux disk format and also possible on OSX but not the default on OSX shipped disks.