when I update to macOS Catalina, my macbook could not use portable hard disk any longer. When I connect the hard disk to the macbook, the flash-light of hard disk is on which shows that it is reading the data, but my macbook did not show the location of the disk. I could use my portable hard disk with my macbook before, could anyone help me to solve the problem?
MacBook, macOS 10.15
Try an SMC reset
https://support.apple.com/en-us/HT201295
I have to do this once in a while when my Macbook cannot "see" external drives.
Also try a different cable - I suspect that USB-c connections are not very durable compared with earlier USB hardware.
It's possible your hard drive may be failing and the fact it stopped working after an update may be coincidence.
I suggest checking on another Mac to see if it is doing the same thing. If so, your hard drive has either failed or is corrupt.
Could the drive have failed to be seen, due to difference of format?
(Usually not a problem, while older HFS+ is often still seen by APFS
Mac with Catalina 10.15.x; & some issues with Time Machine.)
Disk utility may be able to show additional detail about external drive.
I've had a few spare USB external drives; mostly for TM backups.
Good luck & happy computing!🐌🌞🐢
could not show the portable hard disk?
