External Drives not recognised in Tahoe

[davidjames1701]

Hi, just installed Tahoe on my 2020 i7 iMac, but no external drives will show up in finder under Locations, inc the SD card reader, they all show in Disk Utility as unmounted, if I right click on any and select Mount, nothing happens, only 1 drive can be read in Finder, not in locations, but tagged in tags, I've tried First Aid in Disk Utility, Time Machine doesn't recognise anything, all drives are instantly recognised on my old 2013 MacBook Pro running Big Sur, any help would be very appreciated thanks
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[flowrider]

I have an M2 Ultra Mac Pro with nine internal SSDs listed as external. I also have a USB Hub. All my drives show up fine, and I have a card reader hooked up to the hub. When a card is inserted, it also shows up fine. No Issues.

Lou

 

[fisherking]

Hi, just installed Tahoe on my 2020 i7 iMac, but no external drives will show up in finder under Locations, inc the SD card reader, they all show in Disk Utility as unmounted, if I right click on any and select Mount, nothing happens, only 1 drive can be read in Finder, not in locations, but tagged in tags, I've tried First Aid in Disk Utility, Time Machine doesn't recognise anything, all drives are instantly recognised on my old 2013 MacBook Pro running Big Sur, any help would be very appreciated thanks
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an i7? try resetting the SMC (google for your particular mac). all my externals show here (some sometimes thru a hub).

 

[loby]

Most of my externals are showing up accept my Acasis 80gbs SSD External on M1 MacBook Pro.

Downgraded to macOS Seauoia and shows up fine.

 

[840quadra]

Hi, just installed Tahoe on my 2020 i7 iMac, but no external drives will show up in finder under Locations, inc the SD card reader, they all show in Disk Utility as unmounted, if I right click on any and select Mount, nothing happens, only 1 drive can be read in Finder, not in locations, but tagged in tags, I've tried First Aid in Disk Utility, Time Machine doesn't recognise anything, all drives are instantly recognised on my old 2013 MacBook Pro running Big Sur, any help would be very appreciated thanks
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Did you upgrade or install from new?

I had some issues with other items such as external NIC, seeing family sharing, and network drives. I decided to back up my machine, and wiped it completely starting from new. Ever since I erased and started from new, my machine has been working great.

Not the first time I have had to do this with a MacOS upgrade since I became a heavy user back in Panther days (10.3).

 

[davidjames1701]

I have an M2 Ultra Mac Pro with nine internal SSDs listed as external. I also have a USB Hub. All my drives show up fine, and I have a card reader hooked up to the hub. When a card is inserted, it also shows up fine. No Issues.

Lou

Ok, thanks Lou, ill try a hub

 

[flowrider]

^^^^Maybe you misunderstood

All my SSDs are internally mounted in my Mac Pro, hiowever the MacOS shows them as external.

Lou

 

[davidjames1701]

an i7? try resetting the SMC (google for your particular mac). all my externals show here (some sometimes thru a hub).

Ok thanks, ill try that

 

[davidjames1701]

Ok I tried a SMC reset, I just Googled "reset the SMC on my iMac i7" but it didn't work, so ill try resetting the PRAM (Parameter Random-Access Memory) or NVRAM (Non-Volatile Random-Access Memory), btw, all the drives show up instantly on my 2013 MacBook Pro running Big Sur, but can't be updated, and always has been a great performer, I'm thinking ill eventually have to wipe Tahoe and either trying to reinstall or a earlier version, thanks everyone for your help 👍

 

[fisherking]

Ok I tried a SMC reset, I just Googled "reset the SMC on my iMac i7" but it didn't work, so ill try resetting the PRAM (Parameter Random-Access Memory) or NVRAM (Non-Volatile Random-Access Memory), btw, all the drives show up instantly on my 2013 MacBook Pro running Big Sur, but can't be updated, and always has been a great performer, I'm thinking ill eventually have to wipe Tahoe and either trying to reinstall or a earlier version, thanks everyone for your help 👍

how are they formatted? anyway. if you can, call apple, let them sort this out for you... good luck!

 

[davidjames1701]

how are they formatted? anyway. if you can, call apple, let them sort this out for you... good luck!

Some are ex fat, & like i said, all show up instantly on my old MacBook running Big Sur, will Apple Support advise on a 2020 iMac ?

 

[fisherking]

Some are ex fat, & like i said, all show up instantly on my old MacBook running Big Sur, will Apple Support advise on a 2020 iMac ?

apple will. and i suspect it's a format issue. let us know what happens!

 

[davidjames1701]

apple will. and i suspect it's a format issue. let us know what happens!

I’ll definitely let you know, I’m thinking it must be something to do with the install of Tahoe, because of my MacBook running Big Sur sees them instantly in finder ? Tahoe sees them in Disk Utility as unmounted, but will not mount them ?

 

[davidjames1701]

I’ll definitely let you know, I’m thinking it must be something to do with the install of Tahoe, because of my MacBook running Big Sur sees them instantly in finder ? Tahoe sees them in Disk Utility as unmounted, but will not mount them ?

I’ve just found this, I haven’t read it though yet, as it’s after midnight here, but it looks like Apple have a problem with Tahoe, sounds similar to my problem

Tahoe not recognizing External Hard Drive… - Apple Community

discussions.apple.com

 

[chabig]

1. Do they mount another user account?
2. Can you run First Aid on them while unmounted?
3. Have you tried mounting in terminal? If not, the errors message may help identify the problem.
4. Have you tried rebooting in Safe Mode? If they mount there, you might have some incompatible software installed.

To mount in Terminal, enter “diskutil list” and press Return. Identify your drive by size, name, or type (e.g., /dev/disk2 for an external HDD; note the volume identifier like /dev/disk2s1). Then type “diskutil mount /dev/diskXsY” (replace with your identifier, e.g., diskutil mount /dev/disk2s1) and press Return.

If they do mount after this, I’d run First Aid on them again.

 

[davidjames1701]

1. Do they mount another user account?
2. Can you run First Aid on them while unmounted?
3. Have you tried mounting in terminal? If not, the errors message may help identify the problem.
4. Have you tried rebooting in Safe Mode? If they mount there, you might have some incompatible software installed.

To mount in Terminal, enter “diskutil list” and press Return. Identify your drive by size, name, or type (e.g., /dev/disk2 for an external HDD; note the volume identifier like /dev/disk2s1). Then type “diskutil mount /dev/diskXsY” (replace with your identifier, e.g., diskutil mount /dev/disk2s1) and press Return.

If they do mount after this, I’d run First Aid on them again.

Thanks, I’ve run first aid with no success, I’ll run it again to SS the results, and I’ll try the rest, only other third party SW I’ve installed is my Eset Security software, but I’m sure they wasn’t being recognised before that.

 

[gilby101]

Some are ex fat, & like i said, all show up instantly on my old MacBook running Big Sur, will Apple Support advise on a 2020 iMac ?

macOS support for exFAT is more restricted than it used to be, particularly if the formatting was not with macOS. You may need to reformat with a recent macOS.

 

[davidjames1701]

macOS support for exFAT is more restricted than it used to be, particularly if the formatting was not with macOS. You may need to reformat with a recent macOS.

Ok, I’ll try that, what do you recommend ?

 

[gilby101]

Ok, I’ll try that, what do you recommend ?

With macOS you are best with APFS format. But if you need exFAT (e.g. because you will also use the drive with Windows), then use exFAT. exFAT is less robust (more easily corrupted) than APFS.

 

[davidjames1701]

With macOS you are best with APFS format. But if you need exFAT (e.g. because you will also use the drive with Windows), then use exFAT. exFAT is less robust (more easily corrupted) than APFS.

ok thanks, I've tried formatting a blank drive on my iMac in APFS, just came up as not mounted, and wouldn't mount on my iMac, ejected it, plugged it into my 2013 MacBook Pro on big Sur, mounted and showed up in finder instantly, and on a hub too

 

[davidjames1701]

macOS support for exFAT is more restricted than it used to be, particularly if the formatting was not with macOS. You may need to reformat with a recent macOS.

After formatting to APFS on my iMac with

 

[bzgnyc2]

After formatting to APFS on my iMac withView attachment 2567230

Note that looks like 'Mac OS Extended (Case-sensitive, Journaled)' aka 'Case-sensitive Journaled HFS+' rather than APFS. Two things I would try:
1) APFS (standard, not encrypted, not case sensitive, etc)
2) Mac OS Extended (Journaled) (again standard, not encrypted, not case sensitive,etc)

I am not saying case sensitive shouldn't work but if things are going wrong that is something I would try toggling since it is rarely used on Macs. Ditto for encryption. Also Apple has been removing support for things like creating encrypted HFS+ volumes in recent MacOS and its support more generally might by waning.

 

[davidjames1701]

sorry, it is, I've re formatted with disk utility into APFS, but still would not mount, ran first aid on it twice, nothing, but it did come up with what looks like a error code -69842

 

[bzgnyc2]

sorry, it is, I've re formatted with disk utility into APFS, but still would not mount, ran first aid on it twice, nothing, but it did come up with what looks like a error code -69842

I was just going by the previous message you posted where the screenshot showed, "Initiatlized /dev/rdisk2s1 as a 931 GB case-sensitive HFS Plus volume with a 81920k journal".

However, I see from your latest screenshot,reformatting as APFS didn't fix the issue.

Few questions:
1) I assume you are using Erase from Disk Uility to setup the drive and selecting the GUID Partition Map?
2) What is model of USB/SSD and how is it connected to the iMac (direct connection? which port on the iMac)?
3) Can you post a snapshot or copy/paste of Info from Disk Utility? Ideally also USB and Storage sections of System Report. If you can use Terminal, the output of "diskutil info disk2" (assuming "disk2" is what appeared as the "BSD device" in the output of Info from Disk Utility)

 

[davidjames1701]

I was just going by the previous message you posted where the screenshot showed, "Initiatlized /dev/rdisk2s1 as a 931 GB case-sensitive HFS Plus volume with a 81920k journal".

However, I see from your latest screenshot,reformatting as APFS didn't fix the issue.

Few questions:
1) I assume you are using Erase from Disk Uility to setup the drive and selecting the GUID Partition Map?
2) What is model of USB/SSD and how is it connected to the iMac (direct connection? which port on the iMac)?
3) Can you post a snapshot or copy/paste of Info from Disk Utility? Ideally also USB and Storage sections of System Report. If you can use Terminal, the output of "diskutil info disk2" (assuming "disk2" is what appeared as the "BSD device" in the output of Info from Disk Utility)

Ok thanks, I’ll check them tomorrow 👍🏻