You are now mentioning a My Book drive. Where is that attached? The My Cloud USB port? If so there is a well known issue in this subforum with USB hard drives that are attached to a My Cloud where the USB drive Share name is replicated exactly as you mention, _1, _2, _3, etc.
If the My Book is not attached to the My Cloud’s USB port can you post a screen capture of what you are seeing to better show what your attempting to describe?
The solution to the USB duplicate name issue is to eject the USB drive through the My Cloud Dashboard, then access the Dashboard > Shares page and remove all Shares that have the USB drive’s name. Then reattach the USB drive to the My Cloud, access the Dashboard > Shares page again, select the USB drive Share name and rename it back to the original USB drive name.
Here are just a few past threads where this duplicate USB name issue has been discussed:
https://community.wd.com/t/my-safepoints-disappear/160698
https://community.wd.com/t/new-release-firmware-release-04-04-02-105-1-27-2016/148441/68
https://community.wd.com/t/mycloud-creating-numerous-aliases-for-same-drive/160161
https://community.wd.com/t/usb-drive-makes-new-name/152675
https://community.wd.com/t/dublicate-shares-after-reboot/153348
