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<blockquote data-quote="AMACL" data-source="post: 1895327" data-attributes="member: 298303">OK (again), I managed to start it up in Recovery mode <img class="smilie smilie--emoji" loading="lazy" alt="🥳" title="Partying face&nbsp; &nbsp; :partying_face:" src="https://cdn.jsdelivr.net/joypixels/assets/6.5/png/unicode/64/1f973.png" data-shortname=":partying_face:" />. I launched the disk utility and checked the disk usage info :Mac HD : Used 177.8 Gb (plus 5 Gb &quot;other&quot;use). Free 317 Gb .I launched Repair Disk (which is known as SOS in French, his machine is running in French so I have to use my imagination <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />). It has just informed me that it was unable to dismount the disk to repair it, so the operation failed. Why am I not surprised?If it is of any help, disk utility in Recovery mode also told me that the Mac OS Base System is using 1.28 Gb and has 721 Mb free. Just saying.Strangely, to me anyway, before launching repair disk I saw the information that the hard disk is &quot;shared among 4 volumes.&quot; Huh? I never partitioned the disk, as far as I can recall,</blockquote>

[QUOTE="AMACL, post: 1895327, member: 298303"] OK (again), I managed to start it up in Recovery mode 🥳. I launched the disk utility and checked the disk usage info : Mac HD : Used 177.8 Gb (plus 5 Gb "other"use). Free 317 Gb . I launched Repair Disk (which is known as SOS in French, his machine is running in French so I have to use my imagination :)). It has just informed me that it was unable to dismount the disk to repair it, so the operation failed. Why am I not surprised? If it is of any help, disk utility in Recovery mode also told me that the Mac OS Base System is using 1.28 Gb and has 721 Mb free. Just saying. Strangely, to me anyway, before launching repair disk I saw the information that the hard disk is "shared among 4 volumes." Huh? I never partitioned the disk, as far as I can recall, [/QUOTE]

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