After re-connecting it to my old MacBook, I was able to erase it without any issues. I ran Disk Utility to erase it and try again, but it got stuck during the erase process. I set it up as Time Machine backup, and even though the first data transfer was successful, Time Machine got stuck with a “waiting to complete first backup” message. After that, it was successfully mounted on my new MacBook Pro. I ran Disk Utility (on the old MacBook running Mojave) and re-initialized it with a single APFS partition (as opposed to HFS+). I then connected it to my old MacBook (via a USB cable) and it got mounted without any issues.
Older Windows files often require a format external drives simply don’t ship with knowing how to reformat external hard drive Mac and PC computers share is vital in these circumstances. When I first connected it, it failed to mount (the “mount_hfs” process was stuck indefinitely). Plug the external hard drive into your Mac directly or via USB. Those of us who have an external drive shared with Windows machines know formatting can be critical to productivity. Secure erase options are available only for some types of storage devices.
(Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. 2 Reformat the USB drive in Disk Utility.
1 Download EaseUS Data Recovery Wizard for Mac, the professional Mac data recovery software, to perform a full USB drive data recovery. These steps in Terminal did the trick, thanks.
Have decided to run the computer with an external USB drive, but was unable to install the OS as the external drive wasn’t formatted correctly, and I was unable to do it with disk utility. When I first connected it, it failed to mount (the mounthfs process was stuck indefinitely). Click the Format pop-up menu, then choose a file system format. As long as the data matters, you need to follow the standard procedure to ensure zero data loss. I have a mid 2012 MacBook Pro with the dreaded SATA cable issue, have replaced it 5 times. I’m having similar problems with the 2021 MacBook Pro (running Monterey) and a brand-new G-Drive (USB-C). I’m having similar problems with the 2021 MacBook Pro (running Monterey) and a brand-new G-Drive (USB-C).