Apple Event: May 7th at 7 am PT
Hi All,
I have a question. Just after the software upgrade from Catalina to Big Sur, my mac (Macbook Air 13-inch, Early 2015) stopped mounting any usb external discs. Doesn't matter, if it's an usb ssd card reader, usb stick, or external hdd. Does anyone have a similar problem, and any possible solution?
Thanks
MacBook Air 13″, macOS 11.0
Nieznosna3 wrote:
Hi All,
I have a question. Just after the software upgrade from Catalina to Big Sur, my mac (Macbook Air 13-inch, Early 2015) stopped mounting any usb external discs. Doesn't matter, if it's an usb ssd card reader, usb stick, or external hdd. Does anyone have a similar problem, and any possible solution?
Thanks
Have you rebooted and tried again?
You can Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379
Simply open the Disk Utility App > Click the volume in question > in the upper right hand corner of the app window click "Mount".
This action will mount the disk in question manually, not resolution for the disk automatically mounting, but will provide you GUI access.
To solve this problem, I tried to scan/recover an external SSD with macOS' disk utility, but the utility ran into a kernel panic while checking the catalog file.
panic(cpu 4 caller 0xffffff8009cb2f96): "jnl: end_tr: !!!DANGER!!! bp 0xffffffa0ab81e560 flags (0x0) not LOCKED & DELWRI\n"@/System/Volumes/Data/SWE/macOS/BuildRoots/2288acc43c/Library/Caches/com.apple.xbs/Sources/hfs/hfs-556.100.11/core/hfs_journal.c:3951
Backtrace (CPU 4), Frame : Return Address
0xffffffb0c6baae80 : 0xffffff800828e02d
0xffffffb0c6baaed0 : 0xffffff80083d48e3
0xffffffb0c6baaf10 : 0xffffff80083c4eda
0xffffffb0c6baaf60 : 0xffffff8008232a2f
0xffffffb0c6baaf80 : 0xffffff800828d84d
0xffffffb0c6bab0a0 : 0xffffff800828db43
0xffffffb0c6bab110 : 0xffffff8008a9d68a
0xffffffb0c6bab180 : 0xffffff8009cb2f96
0xffffffb0c6bab210 : 0xffffff8009cb56cc
0xffffffb0c6bab270 : 0xffffff8009ce7c95
0xffffffb0c6bab2b0 : 0xffffff8009caa131
0xffffffb0c6bab330 : 0xffffff8009cbe7b2
0xffffffb0c6baba00 : 0xffffff8008554d24
0xffffffb0c6baba90 : 0xffffff80087f2cd0
0xffffffb0c6babf40 : 0xffffff8008940dae
0xffffffb0c6babfa0 : 0xffffff80082331f6
Kernel Extensions in backtrace:
com.apple.filesystems.hfs.kext(556.100.11)[9D1680D0-78DB-3799-8251-A8B54DCAAB4A]@0xffffff8009c9b000->0xffffff8009d03fff
dependency: com.apple.filesystems.hfs.encodings.kext(1)[BE630C5C-CD96-32FD-8807-C410FD628C64]@0xffffff8009d06000->0xffffff8009d07fff
Process name corresponding to current thread: revisiond
Mac OS version:
20E232
Kernel version:
Darwin Kernel Version 20.4.0: Fri Mar 5 01:14:14 PST 2021; root:xnu-7195.101.1~3/RELEASE_X86_64
Kernel UUID: BB2FFEBA-7D53-301F-A238-9867CA51276F
KernelCache slide: 0x0000000008000000
KernelCache base: 0xffffff8008200000
Kernel slide: 0x0000000008010000
Kernel text base: 0xffffff8008210000
__HIB text base: 0xffffff8008100000
System model name: iMac19,1 (Mac-AA95B1DDAB278B95)
System shutdown begun: NO
Panic diags file available: YES (0x0)
Hibernation exit count: 0
System uptime in nanoseconds: 1258266318790
Last Sleep: absolute base_tsc base_nano
Uptime : 0x00000124f68459fe
Sleep : 0x0000000000000000 0x0000000000000000 0x0000000000000000
Wake : 0x0000000000000000 0x0000000d492f1aa0 0x0000000000000000
last started kext at 470507049336: >!UAudio 405.39 (addr 0xffffff7fa1512000, size 315392)
last stopped kext at 584889130857: >IOPlatformPluginLegacy 1.0.0 (addr 0xffffff7fa1904000, size 36864)
It turns out my problem has been solved by resetting SMC and PRAM/NVRAM. A diagnostic program that I have used for years may have been modifiying registers. After removing that program and doing the reset the issue has not returned for long enough that I think the issue is resolved.
I’ve had the same problem with flash drives. I spent hours yesterday and another hour today on with Apple.
We ran through every type of fix mentioned here and more. I dug out and old iPad and lightening dongle out of curiosity, plugged in the flash and it worked! Bizarre thing is, after testing several on the iPad, they then worked with the usb c dongle on my MacBook.
The senior tech I worked with today documented all that and is escalating it up the chain. I did share this thread with him since it seemed new to all three techs I spoke with but isn’t a new issue. Only thing I can come up is that it’s somehow power related. No clue how or why at this point.
I had the same problem, and accidentally discovered a solution that is working. In Finder Preferences, under Show These Items on the Desktop, uncheck everything except Hard Disks. Then reboot, and then open Finder Pref and check the other items.
Great Success!!!!
Thank you so much this finally worked I just changed the disk number and I needed to mount a NTFS disk so I changed exfat to ntfs.
This is what I used in Terminal: sudo mkdir /Volumes/External/ && sudo mount -t ntfs /dev/disk2s4 /Volumes/External/
Just change the disk2s4 to whatever disk you want to mount Ex. disk2s1, disk2, and etc.
First make sure the Finder's General preference pane has all checkboxes checked.
Next, if necessary do the following: How to reset the SMC of your Mac - Apple Support
I went apple support and searched for resetting SMC and PRAM. Their instructions are better than what I would type.
https://support.apple.com/en-us/HT201295
Do you share the drive with PCs? If not then you should use one of these formats for your EHDs:
Yep, I’ve done that too, buddy.
and then the NVRAM/PRAM reset. Ain’t help 😞
but thanks
That’s exactly what I’ve done hehe, I normally wait too, but not this time..
hopefully it will be fixed soon, otherwise- back to Catalina too
@superstanley31 , @alex6969 thanks, I’ll check that
I used paragon NTFS previous to Big Sur, but did not work after updating to Big Sur.
I since moved to Tuxera NTFS, and is briliant.
After so long, there is still no solution w/ Big Sur.
This is damageable for private and pro users !
Big Sur - External disc not mounting
