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<blockquote data-quote="MacInWin" data-source="post: 1952016" data-attributes="member: 396914">In Disk Utility, click on the &quot;View&quot; button on the menu bar, then select &quot;Show All Devices.&quot; Once it shows all the devices, select the top level of the external drive, which should show as the actual manufacturer name and model. Then click on Partition and create one single APFS partition on the drive (Note: That action will erase the entire drive, so be sure that if there is something on it you want, you get that off first.) Give the partition whatever name you want. Choose GUID as the Partition scheme.Once it has run, you should have a single Container on the drive and in the container is a single Volume, with the name you chose for the drive. That volume should now mount. Now open Time Machine settings and point to the newly formatted drive as the target. TM will take over the drive and add additional formatting to it for backup use. (Basically adding encryption, as I recall.) Now it should be able to make backups to that drive.NOTE: Once you point to that drive for TM, it cannot be used for anything else because TM now marks it as being ONLY for TM. If that is not what you want, let us know and there are things to do that can make at least part of the drive still available to you.</blockquote>

[QUOTE="MacInWin, post: 1952016, member: 396914"] In Disk Utility, click on the "View" button on the menu bar, then select "Show All Devices." Once it shows all the devices, select the top level of the external drive, which should show as the actual manufacturer name and model. Then click on Partition and create one single APFS partition on the drive (Note: That action will erase the entire drive, so be sure that if there is something on it you want, you get that off first.) Give the partition whatever name you want. Choose GUID as the Partition scheme. Once it has run, you should have a single Container on the drive and in the container is a single Volume, with the name you chose for the drive. That volume should now mount. Now open Time Machine settings and point to the newly formatted drive as the target. TM will take over the drive and add additional formatting to it for backup use. (Basically adding encryption, as I recall.) Now it should be able to make backups to that drive. NOTE: Once you point to that drive for TM, it cannot be used for anything else because TM now marks it as being ONLY for TM. If that is not what you want, let us know and there are things to do that can make at least part of the drive still available to you. [/QUOTE]

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