User level: Level 1 (4 points)My Book Studio failure after Sequoia 15.8. upgrade.
Hi - I have My Book Studio for using Time Machine back ups which has worked fine for years .....until the Sequoia 15.8 upgrade.
I run a 2018 Apple Mac with 4 thunderbolt ports. Have switched off the Apple firewall but still won't mount.
I have no USB ports - the connection is via the multi hub.
Disc Utility shows no external drives.
Any advice gratefully will be greatly appreciated 😊
Posted on Sep 28, 2026 4:29 AM
User level: Level 10 (99,154 points)Sep 28, 2026 7:52 AM in response to UsualAlias
Those WD MyBook drives do not last forever.
The Mac ports support both Thunderbolt and USB devices.
Test the WD MyBook plugged into a different Mac or PC.
Bypass the multi hub and test the WD MyBook plugged into the Mac using a USB-A to USB-C adapter.
User level: Level 10 (99,154 points)Sep 28, 2026 12:19 PM in response to UsualAlias
You're welcome.
If the WD MyBook is caput, replace it and start Time Machine backups on the new external drive.
Back up your Mac with Time Machine - Apple Support
User level: Level 1 (4 points)Sep 28, 2026 11:36 AM in response to den.thed
Thanks for your helpful reply. 😊
Originally posted at discussions.apple.com/thread/256366462