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One of my Macs suddenly fails to read my U-disk. I have restarted the machine several times it still shows "0 items, 102.11 GB available".

no items

While my other Mac can read the u-disk without any problem. How do I fix it ?

u-disk

With the comment I got from nohillside I did another test, first cd into a folder, then ran open . to open it in Finder and Finder can show it!!

But if I click its parent folder then Finder shows "0 item" again.

cd into a folder

Finder shows the folder content!

Finder show a folder

Qiulang 邱朗
  • 787
  • If you open Terminal on the first Mac and run cd /Volumes/N*NAME; ls, what do you see? If you open Disk Utility and select the drive, what do you see? Please edit the question with the results. – nohillside Dec 03 '23 at 09:34
  • @nohillside sorry for the late reply. ls I can see everything. So it this a bug of finder? – Qiulang 邱朗 Dec 03 '23 at 12:45
  • Sounds like it is a bug in finder. Have the files accidentally been set to hidden? You can view hidden files in finder by pressing the keyboard shortcut command+shift+. (period). Alternatively, enter defaults write com.apple.finder AppleShowAllFiles TRUE in terminal. To change back to hidden files just change TRUE to FALSE in the above command... To permanently change the hidden files to be visible, you can run another command, but I forgot it ages ago, maybe google it :) – AVelj Dec 03 '23 at 13:59
  • @AVelj check mu updated content, I don't think it is because of hidden files. – Qiulang 邱朗 Dec 03 '23 at 14:42
  • Hmm... I wonder if your external drive has two partitions to it and you're not clicking on the correct partition? Check how many partitions your external drive has by running diskutil list and tell me if it's showing multiple partitions? Also in Finder's preferences, make sure to enable "External Disks" under Sidebar locations by ensuring it's a tick (✔️) and not a dash (-) in the checkbox. If this checkbox is showing a dash (-), it may suggest it is partially hiding some partitions of the external drive in the sidebar, which happens if you previously manually removed it from sidebar. – AVelj Dec 03 '23 at 15:27
  • @AVelj thanks for spending time in looking into this, diskutil list shows "/dev/disk4 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *125.3 GB disk4 1: Windows_FAT_32 NO NAME 125.3 GB disk4s1 – Qiulang 邱朗 Dec 04 '23 at 09:54
  • sidebar setting is a tick (I had checked this before I asked the question) – Qiulang 邱朗 Dec 04 '23 at 09:55
  • Hmm, I'm at a loss then, because macOS can read Windows FAT32 disk drives and it doesn't appear to have a second partition from what you've said. The only other thing I can think of is read/write permissions are blocked, but that wouldn't make sense since you can see it from terminal... The only other thing I can think of is if the files have been dragged to trash but you never emptied the trash when the USB was plugged in? – AVelj Dec 04 '23 at 16:51
  • @AVelj I would assume this is just a "stupid" bug. – Qiulang 邱朗 Dec 05 '23 at 02:05
  • Hi, today I used "First Aid" in Disk Utility on it. I did not expect that would repair it but to my surprise it did! Now finder can show my u-disk again! – Qiulang 邱朗 Dec 22 '23 at 14:17

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