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General Discussions
Switcher Hangout (Windows to Mac)
Macbook Pro sees external drives but doesn't mount or show them in the disk utility.
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<blockquote data-quote="James2" data-source="post: 1812390" data-attributes="member: 401673"><p>Thanks! </p><p></p><p>After the NVRAM reset the Disk Utility showed the drives. </p><p></p><p>But reformatting to "MAC OS EXtended (Journaled)" (The APFS formats are not available here) the disks gave this error:</p><p>"Unable to unmount disk"</p><p></p><p>After the SMC reset I was able to reformat the disks. . </p><p></p><p>First Aid failed and suggested to run in recovery mode with 2 of the 3 disks. (Including the 1 day old disk) </p><p></p><p>First Aid in Recovery mode gave this error:</p><p>[ATTACH=full]29188[/ATTACH]</p><p></p><p>In recovery mode the APFS options are available for reformatting so I tried that. With the APFS format type I ran the First Aid again and both disks showed:</p><p>[ATTACH=full]29189[/ATTACH]</p><p></p><p>So it seems fixed. I am not sure why the format type played a role but it seems to be the case. I sure needed the NVRAM and SMC reset in order to get things going.</p><p></p><p></p><p></p><p></p><p>Edit: I celebrated to early, it seems the OS before the NVRAM / SMC resets somehow killed the disks. I just tried to copy 72GB to one of the disks and it stopped at 42GB while still connected. It's strange since all 3 disks have similar problems, one disk is 1 day old. USB disks and SD cards work fine. It might be something MacInWin suggested, with the disks randomly going to 'sleep' (although I can still hear them running when unrsponsive.)</p></blockquote><p></p>
[QUOTE="James2, post: 1812390, member: 401673"] Thanks! After the NVRAM reset the Disk Utility showed the drives. But reformatting to "MAC OS EXtended (Journaled)" (The APFS formats are not available here) the disks gave this error: "Unable to unmount disk" After the SMC reset I was able to reformat the disks. . First Aid failed and suggested to run in recovery mode with 2 of the 3 disks. (Including the 1 day old disk) First Aid in Recovery mode gave this error: [ATTACH=FULL]29188[/ATTACH] In recovery mode the APFS options are available for reformatting so I tried that. With the APFS format type I ran the First Aid again and both disks showed: [ATTACH=FULL]29189[/ATTACH] So it seems fixed. I am not sure why the format type played a role but it seems to be the case. I sure needed the NVRAM and SMC reset in order to get things going. Edit: I celebrated to early, it seems the OS before the NVRAM / SMC resets somehow killed the disks. I just tried to copy 72GB to one of the disks and it stopped at 42GB while still connected. It's strange since all 3 disks have similar problems, one disk is 1 day old. USB disks and SD cards work fine. It might be something MacInWin suggested, with the disks randomly going to 'sleep' (although I can still hear them running when unrsponsive.) [/QUOTE]
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General Discussions
Switcher Hangout (Windows to Mac)
Macbook Pro sees external drives but doesn't mount or show them in the disk utility.
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