If you move the Library correctly, then things will work as always.
Make sure the drive is formatted Mac OS Extended (Journaled)
1. Quit iPhoto
2. Copy the iPhoto Library from your Pictures Folder to the External Disk.
3. Hold down the option (or alt) key while launching iPhoto. From the resulting menu select 'Choose Library' and navigate to the new location. From that point on this will be the default location of your library.
4. Test the library and when you're sure all is well, trash the one on your internal HD to free up space.
I have successfully copied my iPhoto Library to the External Hard Drive as per your advice.
A couple of questions:
1. If I delete the iPhoto Library from my internal hard drive, how do I get it back if I need it?
2. If my iPhoto library is on my external hard drive, can I add to it?
3. I have now also tried connecting my external hard drive to the USB storage port on my wireless modem/router. I can save Word files to it wirelessly, and retrieve them but I cannot see my IPhoto Library. Nor can I copy the iPhoto library to it as per your instructions above. The perfect situation for me is if I could just plug my external hard drive into the wireless modem/router and not directly into my MacBook with no loss of iPhoto or screensaver function. Can it be done?
1. By copying it back from the external? By restoring from your back up?
2. Using the Library on the external is exactly the same as on the internal. So just use it.
3. No, you should not use a wireless connection to the disk with the iPhoto Library. A strong warning: If you're trying to edit the Library (that is, make albums, move photos around, keyword, make books or slideshows etc.) or edit individual photos in it via Wireless be very careful. Dropouts are a common fact of wireless networking, and should one occur while the app is writing to the database then your Library will be damaged. Simply, I would not do this with my Libraries.
Further, if you cannot copy to the disk, are you sure it's the corrct format?
Thanks for your prompt reply.
1. By copying it back from the external. How's it done?
3. I take your point about the dropouts. I erased my external last night and noted that it is Mac OS Extended (journaled) and as I say, I have been able to save a file from WORD and retrieve it but there is no sign of my iPhoto Library which is certainly there and usuable upon connecting the external directly to the MacBook.
The MacBook is running 10.5.8 (Leopard)
Select any photo in the iPhoto Window and right click on it. From the resulting menu select 'Show File (or 'Show Original File' if that's available). A Finder Window should open with the file selected. Switch to Column View in the Finder and you'll be able to track back to the actual location of the Library.
Yes, done. I can see that iPhoto is using the external, which is currently connected by USB to the MacBook. If I connect the external to the USB storage port on the wireless modem/router I can't see any evidence of the iPhoto library. All I see is the WORD file I saved as a trial.
Finder shows me that the iPhoto Library is there on the external - when connected directly to the MacBook, but when the external is connected to the router/modem it doesn't show the iPhoto library.