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Time Machine on an Ext. Drive

I had time machine running on a partition of an external drive. It started to frustrate and cause of a delay of computer's starting time (it takes more than 5 minutes after entering my password) then I deleted the Time Machine from my system but now I can not mount / erase the Time Machine partition on the drive. Is there another way to erase a partition other than macOS's disk utility? so then I can reuse the same partition for a new Time Machine.

MacBook Pro 15″

Posted on Mar 24, 2023 5:08 AM

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Question marked as Top-ranking reply

Posted on Mar 24, 2023 7:22 AM

Once you follow previous advise above.


You may have to Reformat the Entire Drive via this method from Apple


link below


Erase and reformat a storage device in Disk Utility on Mac - Apple Support (CA)


This should give to user the ability to Re-Partition the drive, if that is what you chose to do

10 replies

Mar 24, 2023 11:19 PM in response to PRP_53

One last question. I can not erase the volumes nor delete the partitions could that be because I encrypted them when I create. If so how can I erase and delete the partitions (I mount them with my password but when I ask disk utility to erase the partition it says failed to erase it) your help would be much appreciated 🙏

Time Machine on an Ext. Drive

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