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<blockquote data-quote="IWT" data-source="post: 1940836" data-attributes="member: 83420">I think the problem you face is that Apple has repeatedly stated that EHDs used for Time Machine (TM) should not be used for any other purpose.See this article:[URL unfurl=&quot;true&quot;]https://support.apple.com/en-gb/104984[/URL]Up until the recent past, many users, ignored this advice and did indeed use the TM EHD for storing other data.I have no direct evidence that Apple has in any way made this impossible, even though it's unwise to do so - EHD fails; loss of TM backup and all the other data!&nbsp; But see No 5 in the paragraph headed &quot;Set up the storage device....&quot; in the article I linked above.&nbsp; <ul>
<li data-xf-list-type="ul">(Your Mac may ask if you want to erase the storage device so that it can be used for Time Machine. Either erase it or select a different backup disk or volume.)</li>
</ul>You asked about formatting an EHD for TM purposes.&nbsp; As you are running Sonoma (and for some versions before it) the Formatting should be Guid Partition and APFS.&nbsp; In the usual way of doing this; you would either do the correct formatting yourself or simply tell the Mac to use a specific EHD and the system would automatically format it for you - and it would probably erase any other data on it and ensure a &quot;clean&quot; EHD for TM purposes.From the above, you can see how sharing is not permitted - at least that's my personal opinion.I hope this helps you in understanding your problem <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /> Ian</blockquote>

[QUOTE="IWT, post: 1940836, member: 83420"] I think the problem you face is that Apple has repeatedly stated that EHDs used for Time Machine (TM) should not be used for any other purpose. See this article: [URL unfurl="true"]https://support.apple.com/en-gb/104984[/URL] Up until the recent past, many users, ignored this advice and did indeed use the TM EHD for storing other data. I have no direct evidence that Apple has in any way made this impossible, even though it's unwise to do so - EHD fails; loss of TM backup and all the other data! But see No 5 in the paragraph headed "Set up the storage device...." in the article I linked above. [LIST] [*](Your Mac may ask if you want to erase the storage device so that it can be used for Time Machine. Either erase it or select a different backup disk or volume.) [/LIST] You asked about formatting an EHD for TM purposes. As you are running Sonoma (and for some versions before it) the Formatting should be Guid Partition and APFS. In the usual way of doing this; you would either do the correct formatting yourself or simply tell the Mac to use a specific EHD and the system would automatically format it for you - and it would probably erase any other data on it and ensure a "clean" EHD for TM purposes. From the above, you can see how sharing is not permitted - at least that's my personal opinion. I hope this helps you in understanding your problem :) :) Ian [/QUOTE]

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