Moving over to a secondary hard disk
My three-year-old iMac running Mavericks has started showing that my startup disk is full and I should delete some files. My second drive is 1TB large and empty. How do I transfer my data (mainly music and photos) to that drive and, more importantly, get the computer to use it for my data and not the startup one? David Leppard
You can move your iTunes library by clicking iTunes > Preferences > Advanced, clicking Change next to ‘iTunes Media folder location’ and picking a folder on your empty 1TB drive. The procedure for iPhoto is slightly different. You need to move the iPhoto Library file itself. This is in the Pictures folder within your home folder by default, and you can just drag it to the empty drive in Finder. Then, to tell iPhoto where to find it, hold the å key down while you start iPhoto. When it asks which library you want to use, click ‘Other Library’ and navigate to the place where you moved the library file.
From now on, both iTunes and iPhoto will use the new locations for any data you add. This will probably free plenty of space on your startup disk and you can avoid filling it up again in the future by installing apps to the new drive as well.
Most non-Apple apps don’t mind which folder you drag them to, although its possible they won’t automatically update for you. Don’t forget to include the new drive in your Time Machine backups. Check it isn’t listed in the Privacy tab of Time Machine’s preferences for that.
Both iPhoto and Photos let you select the default library file when you hold å while opening them.