![]() ![]() If you are really, absolutely sure you want to wipe out your main disk, detach all external drives first and then you can use sudo dd if/dev/zero of/dev/disk0 bs65536 and leave it to run a few seconds. Select it and you can verify it to ensure it's not corrupt. When I tried to create a partition it says ' The disk is too small to contain partition' and the buttons are grayed out. Once it's done, it'll appear in the left-hand pane underneath your drives for easy access. Make sure there's enough room on your target drive, then click Save and be prepared to wait while the image is created (depending on the size of the backup). ![]() Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Partition tab in the DU main window. After DU loads select your external hard drive (this is the entry with the mfgr.s ID and size) from the left side list. Seagate internal drives are not preformatted and must be formatted before use. If you are not sure which one is best for you the File System Format Comparisions highlights the main difference between file systems. Select a location and filename for your image if backing up a disk partition or entire disk, choose a different disk to save the image to. Select Disk Utility from the main menu and click on the Continue button. If you need to use your drive on both Mac and PC then it’s best to format exFAT. To back up an existing disk, select it in the left-hand pane and click the New Image button. They can be handy for backing up entire partitions or removable disks like USB flash drives. Disk imagesĭisk images are exact copies of a selected disk's contents, held in a single file. Like formatting, partitioning wipes all existing data on your disk, so is best used when setting up a new hard drive for the first time. This enables you to divide a large-capacity disk into smaller subdivisions, which then behave as if they were separate drives. If you select a disk drive rather than a partition, you'll also see a Partition tab appear. Next, click on Security Options… to configure how the drive will be erased: you can choose a more secure setting if there's data on the drive that you want permanently (unrecoverably) removed.įinally, click Erase and wait while the drive is erased. ![]()
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