My Book 8TB is constantly Unmounting and mounting

WD External Drives External Drives for Mac
1

My 1 year old My Book 8TB USB 3 connected to my iMacPro is after zending 6 TB of data (to backup my Pegasus) Is now constantly mounting and unmounting. Can’t get any file of to put it back, what is going on?
I have 2 other 8 TB WD My Book’s and they don’t give any problem. Tested them also, with same cable and power supply.

Thanks in advance for any suggestion

Sjoerd de Vries
The Netherlands

2

I have exactly the same problem. The disk mounts sometimes and sometimes not. Cannot mount the disk with disk utility either. Is there any solution to this problem or do I have to replace the disk because I still have a warranty, Please i f someone can help

3

Something ‘strange’ happend. For testing I installed demo of DriveX. For use of external disk there must someting else installed whoch DriveX did. I rebooted the machine (which I have done several times before) And the drive mounted coorectly Test with DriveX did not show any error. For now I transfer a 40 GB and a 56 GB file (card archiev’s made with FCPX) and no errors, pfff
Wil test more, now he is copying 4.5 TB of data

4

And again he is loosing connection, not so many as before but he is still disconnecting and connecting.

6

I unchecked “put hard disks to sleep when possible” in Energy Saver system preference. That has helped the mounting / unmounting issue for me. Sounds silly but another reason I had issues mounting the disk was because AC power plug had come loose and I didn’t notice. :man_facepalming: