Currently Being ModeratedSep 20, 2012 10:21 AM (in response to JD_mac)
Is your Aperture library managed (all originals included in the library) or referenced (the original masters outside the library)?
To move the library to an external drive, format the drive MacOS Extended (journaled), if it still has the default formatting MS-DOS (FAT) or similar. Preferably use the fastest drive you have and connect it to a fast port, Firewire, Thunderbolt, USB 2.0.
If your Library is managed, you can simply drag it using the Finder to the new location on the external, then double click it to open Aperture with the library on the new volume.
If your Library is referenced, you will have to move the original images too. Use Aperture's relocate original files to do that. Once the library is on the new volume and opened in Aperture, select all images in the Photos view in the browser and use
File > Relocate Originals
to move the original image files to the new drive.
Post back, if you need more detailed directions.
Currently Being ModeratedSep 20, 2012 10:31 AM (in response to JD_mac)
I seem to recall that, when I went through this same thing, all I needed to do was quit Aperture, copy the xxx.aplibrary file to the new location, and relaunch Aperture by double-clicking the library in the NEW location.
See the solution in this thread: