Moving by cut & paste is not really that different from copying and deleting, no.
The explanation for the data loss is buffering. When you ask Finder to cut & paste (or copy and delete - doesn't matter) - all that Finder does it ask the operating system to copy data to the external drive and delete the file from the internal drive.
The operating ...
The common cause of a bus powered drive not operating is the computer isn’t getting enough power through the cable you are using to power the unit.
USB external hard drive is mounted on one MacBook Pro but not another
External hard drive not recognised by MacBook Pro.
USB Hard drive has very small chance of being recognized by Macbook Pro each time it is ...
You are almost there. Check again in Disk Utility app.
You will find APFS as an option in the Format pop-up menu.
You make the same choice of GUID Partition in the other pop-up menu Scheme.
AJA System Test is another commonly used tool to benchmark disk performance for the Mac. It offers graphs and a text report of performance instead of just a dial indicating transfer speed like Black Magic.
If you want to test random I/O, which neither AJA or Black Magic do, you can use the tool fio like you can on Linux. You can expect the IOPS to be much ...
Blackmagic Disk Speed Test
If you're interested in read and write speeds there is an app called Black Blackmagic Disk Speed Test available on the App Store. This doesn't have a database to compare with others but can give you actual speeds for your internal and external drive.
This could be a few things:
In case you chose to encrypt your backups, it may be FileVault2 is currently encrypting the disk. Here you find some instructions how to check that.
As In the accepted answer, it could be spotlight indexing the disk.
It could be your disk's firmware doing some maintenance task. However, in that case the indicator LED will ...
Another possibility is macOS can be performing a disk check (fsck) in the background. This typically happens if you do not eject the disk properly before unplugging it; then the next time you plug it in, macOS will run fsck in the background on the disk before mounting it. (I'm not sure what the behaviour is for disk formatted with Mac OS Extended (Journaled,...
To answer my own question:
Most likely the issue was caused by the WD Driver Utility app, as reported by many in the WD forums.
If not that, it was caused by an unpowered 7x USB-A to USB-C hub that the HDD was connected to earlier.
Either way the problem is now gone.
You seem to have hit a bug in the exFAT code.
I would advise taking the external drive to a different computer, such as for example a Windows PC. Run chkdisk (or fsck on Linux), and the file system back in shape.
Afterwards you should be able to continue using the drive on your Mac.
If not, I would suggest using a different computer to copy away your ...
Jettison is an excellent recommendation, and probably the one I would make for most people.
However, if you want to get into all sorts of Mac automation, you'll definitely want to checkout Keyboard Maestro. You can create a macro that will run when the system goes to sleep, and have that macro run a simple shell script like this:
I had the same issue before with my 4TB Seagate external hard drive too. It also takes too long for the system to recognize my disk, and a lot more issues came with it.
If you unplugged your drive without unmounting / ejecting it properly, it could potentially been occupied by some processes such as quicklookd in the background, this can potentially cause ...
There may be a native way to accomplish your goal; however I do not know how and why I use EventScripts, which among the events it can react to, Computer will sleep and Computer wakes could be use to unmount/remount an attached USB Drive using AppleScripts, shell scripts and or Automator workflows.
You can download the demo version from the developers web ...
There's a 3rd party app available for exactly this purpose. Jettison app automatically ejects your external drives when you put your MacBook to sleep.
It is a paid app with 15 days of free trial available.
Reading the man page of diskutil, I found a command that I thought might provide at least some diagnostics on what was wrong:
When you run this command, it will start monitoring all disk activity and report back to you until you stop it again.
I ran this command and switched off the bricked external drive. Nothing happened.
I switched ...
It is not possible to stop the decryption of the drive while also using the drive.
You can unmount and possibly unplug the external drive, and the decryption will obviously stop.
However, as soon as you plug the drive in again and mount the file system, the decryption process will continue. You cannot ask the system to stop that.
Your options are either ...