When your USB hub corrupts your external hard drive (Mac OS)

Your external hard drive had made a weird sound and has become invisible in Finder.

Take these steps.

NB: This applies to HDs formatted as HFS+ (Mac Extended Journalled). Otherwise, maybe try check this.

(0) Remove all USB devices and do a restart, cold restart and a restart in safe mode. If none work, go to (1).

(1) Connect the External HD, check that the lights are on (if they are) and launch Disk Utility: does the disk appear?

Yes: Great! Choose Repair. Also, maybe check this. If Repair is grayed out, this.
No: Go to (2).
I don’t know since it keeps saying ‘loading disks..’: Wait 5 minutes. If it keeps not opening, go to (2).

(2) Reboot in Safe Mode (CMD + R at startup) and go to Disk Utility. Does the disk appear?

Yes: Great! Choose Repair, and maybe check thisthis and this.
No: Go to (3).
I don’t know since it keeps saying ‘loading disks..’: Wait 5 minutes. If it keeps not opening, go to (3).

(3) Launch Terminal. Also, check this.
Type: diskutil list
Enter. Does your disk appear in the list?
Yes: Great! Jot down the BSD name (something like ‘disk2s1’.)
No: Go to (4).

(4)  Check System Report (About This Mac > System Report > USB). Does the disk appear?

Yes: Great! Jot down the BSD name (something like ‘disk2s1’.)
No: Go to (5). Also check this.

(5) Reboot in Single-User Mode (CMD + S). You might have to turn off FileVault.

Type: sudo fsck_hfs -f /dev/disk2s1
(NB: substitute for disk2s1 the BSD name of your volume!)

Enter.

This will take quite a while depending on how big your disk is.
Also check thisthisthisthis and this.

(6) Use DiskWarrior. Also check this. I did not try (5) as I manage at (4).

 

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