HELP: Moving External HD to Aiport extreme AirDisk problem

dne

Registered
I have a 500GB external HD that I have been using as a Time Machine backup. Now that I have hooked the same drive up to my Airport Extreme and set it (now an Airdisk) to be my Time Machine backup drive, it says there is not enough room.

Has anyone tried to do this before?
 
I see it as a NEW disk. This is because Time machine saves different kind of file local then as an air disk.
 
Yep -- in "local" Time Machine mode (disk connected directly to computer), Time Machine backs up your drive file-for-file into a navigatable folder structure.

When the drive is used as an Air Disk, then the backups go into a special kind of disk image (a sparsebundle, to be exact).
 
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