External Hard Drive Missing After Big Sur Download

I installed Big Sur yesterday. Once installed, my external hard drive no longer showed up. I tried switching ports, restarting my computer, making sure external hard drive was selected in my preferences, etc. When I checked my utility disk, I don’t even see an external option. Only internal. I also tried plugging my external drive into a PC to see if the device was read on another computer. The PC read it. When I was on Catalina earlier in the day, everything worked just fine. Anyone else experiencing this? Any help is appreciated.

MacBook Pro

Posted on Nov 25, 2020 5:47 AM

Reply
Question marked as Top-ranking reply

Posted on Dec 24, 2020 10:21 PM

I was able to recover mine - here's how I did it. I'm going to write out my troubleshooting process as I'm not sure what 100% fixed it.


As I read through this discussion, I was dealing with identical scenario's... my Seagate 4TB external HD, on my Macbook Pro (late-2015) running on Big Sur, wasn't mounting / not being displayed in Finder.


After failed attempts of mounting & running first aid


@Bev_Tabet_Photo suggested downloading/updating the WD Driver (https://support.wdc.com/downloads.aspx?p=294) which I did, although I don't see how this would have played a role in fixing my issue, but it is something I did.


I then reset the SMC (https://support.apple.com/en-us/HT201295)


From here, I opened Activity Monitor and quit the fsck_ext process found under the 'disk' tab


This resulted in the external hard drive being "fixed", however it was only readable, and could not copy any files to it.


I ejected the disk, restarted, reconnected the drive and opened Disk Utility. I ran a new attempt at First Aid, which took a fair amount of time (10-15 minutes)


The First Aid was successful, and I was able to write to the external drive. So far, so good.


Hope this post can manage to help others. Merry Christmas!

243 replies

Apr 4, 2021 6:38 AM in response to debi5475

I remember the days when a Mac could read any hard drive format and you certainly would not need to jump through your own butt to get it to work. That was one of the things we used to wave in the face of the PC lovers. Steve Jobs must be rolling in his grave.

So now if we can get our external drives to be recognized we have to. say goodbye to our backed up data? I'm not sure even Microsoft would say such a thing. I have not tried it but I'm guessing it is impossible to roll back to an earlier Mac OS that actually worked?

Hey Apple any plans to fix this problem? Do I need to start telling friends and family they might as well buy a Windows machine?

Apr 5, 2021 2:05 PM in response to Thor62

Thor62 wrote:

I remember the days when a Mac could read any hard drive format and you certainly would not need to jump through your own butt to get it to work.
Do I need to start telling friends and family they might as well buy a Windows machine?

If your friends and family can't afford the latest Apple devices then yes because apple care won't cover it.

If you live outside the US Apple is obliged to repair any issues caused by an update or upgrade (especially in th EU), but dont be surprised if your told it was your cats fault and you need to replace a battery or something.

Apr 5, 2021 3:16 PM in response to GavrielTech


GavrielTech wrote:

"If your friends and family can't afford the latest Apple devices then yes because apple care won't cover it.

If you live outside the US Apple is obliged to repair any issues caused by an update or upgrade (especially in th EU), but dont be surprised if your told it was your cats fault and you need to replace a battery or something."

Epiphany response: Ha! They won't even ANSWER US to blame the cat. It is pure negligence disrespect and hubris. So insulting. The EU is correct in forcing such laws. No time to look at Reddit but this MUST be a discussion everywhere.

Apr 5, 2021 6:26 PM in response to GavrielTech

GavrielTech

tnx much for posting for history's sake :) Yeah for me this is way advanced tech. I am a simple scholar/writer/researcher. My needs are pretty basic. That Apple would fail in such a major way as to affect my pretty paltry needs is unspeakable and as I have said elsewhere morally and business model bankrupt.. and now to ignore the problem. ???? Well i see no further need of this sexy Mac machine. Again tnx for posting a solution, Forums has disabled my ability to respond with a simple "helpful" and I wonder why??/

May 5, 2021 10:37 AM in response to Xenocide38

Not a solution, this is done by design, AFPS is apple's own file structure system...Recovery developers like Diskwarrior stated that Apple is not sharing codes with them so they can not recover Catalina or Bigsur drives, only Carbon Copy Cloner can since that developer worked foe Apple once, the rest offering help are online services requiring users to upload their hard drive to the World Wide Web and so dont count on this to be 100% private.


The idea that EFI firmware is quietly dropped during Catalina or Big Sur updates is absurd,

During a number of updates I lost access to internal drives and recovered them by using the latest system on devices apple supports, all which happen to be AFPS drives,

-I used an iPad Pro to see if I can get a drive I lost access to via Catalina and it worked, it was all EFI issues with an older MacBook Pro.


You may allege this is forced obsoletion, extortion etc but until there is a logical explanation and evidence your either going to spend ages trying to get a 3+ year older Mac working normally or buy a new one.


The solution is not to update or upgrade if you plan on using an older machine,

The risk of security is a problem when your on older machines, you need 3rd party software for more help but its possible.

May 19, 2021 8:43 AM in response to littlemisspoie

I also have apps and software that no longer work the way they did before. And my machine is very slow. I cannot possibly afford to buy a new machine. Question. How did you go back to Catalina without losing data? I do not have a recent backup from before I let apple sell me on “upgrading”. For now I have been putting up with the dread beach all and all the other things that no longer function as before but I’d prefer to go back to Catalina. What are my risks??

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

External Hard Drive Missing After Big Sur Download

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.