MountVol vs Online OffLine Hard Drives

[Falcon Speed]

I was just wondering what is Online/Offline in disk management use for and how is it different from using MountVol.exe.

Forum Moderators: This is hard drive related. If I posted in the wrong forum, please feel free to move it. Thanks

[Train]

When you take a disk offline, it will no longer show up or be accessible by users until an administrator brings it back online.
http://www.eightforums.com/tutorials...ne-online.html

This seems to be the big difference:

If you need to expand your volume space without reformatting or replacing a hard drive, you can add a mount path to another volume. The benefit of using one volume with several mount paths is that you can access all local volumes by using a single drive letter (such as C: ). You do not need to remember which volume corresponds to which drive letter—although you can still mount local volumes and assign them drive letters.

https://technet.microsoft.com/en-us/.../cc772586.aspx