Can't Connect or Device Offline After Inserting a Replacement Hard Drive For My Cloud Home Duo

Description

Can't connect using the Web or Mobile App after inserting a hard drive.

Used Drives

My Cloud Home Duo does not support a hard drive with a format, partition, or data.

Empty Drives

It will stay offline with a breathing LED until the volume is done.
The rebuild can take 48 hours or more depending on the size of the drive and the number of files.

Resolution

Drives must be new or fully erased.

Need more help?
Answer ID 10850: How to Fully Erase, Low-Level Format, or Write Zeros on a Drive

The LED will revert to solid white when the process has finished.

Need more help?
Answer ID 18042: What Does a Blinking Front LED Mean for WD My Cloud Home?