If you've ever needed to access important files stored in a shared folder on your network but couldn't because your laptop was disconnected from the network, then you can understand the need for offline files. With offline files, you can access copies of your network files even when your computer isn't connected to the network.
Working with offline files is easy. You just choose the files (or folders) on your network that you want to make available offline. Windows automatically creates a copy of each file on your computer. These copies are called offline files. You can work with these files even when you're not connected to the network, and the next time you connect, Windows will automatically sync your offline files with the original files in the network folder.
honestly i did not understand , because an offline hard disk , it's not accessible , windows should not see itHi, rather than trying to explain myself, i believe this does a good job, taken from Microsoft.
Does this help explain?
Read More - Understanding offline files - Windows HelpIf you've ever needed to access important files stored in a shared folder on your network but couldn't because your laptop was disconnected from the network, then you can understand the need for offline files. With offline files, you can access copies of your network files even when your computer isn't connected to the network.
Working with offline files is easy. You just choose the files (or folders) on your network that you want to make available offline. Windows automatically creates a copy of each file on your computer. These copies are called offline files. You can work with these files even when you're not connected to the network, and the next time you connect, Windows will automatically sync your offline files with the original files in the network folder.
Regards,
Jamie