My book western digital not recognized on windows after time machine backup
If by 'not recognized' you mean not able to be mounted, this is because it has been formatted as Mac OS Extended (Journaled) — HFS+.

To be able to read/write to it in Windows, you can format it to FAT.


Open Disk Utility and connect your disk.
Select the disk and choose the Erase tab.
Select MS-DOS (FAT) as the format.


Click Erase.


All data on the disk will be lost.