HT1338 I try to buy songs itunes but there is a message stating that my disk is full and to empty out the trash can. But i don't know what disk it speaks of?

Question

I try to buy songs itunes but there is a message stating that my disk is full and to empty out the trash can. But i don't know what disk it speaks of?

Answer 1

The "disk" is your startup volume, which is usually called "Macintosh HD" (unless you changed it).  Your iTunes media files (such as song files), and basically everything else, are stored on that volume (unless you changed it).
You should create some free space as soon as possible, because the system (OS) and applications use free space to write temporary files as part of normal operations.  If there is very little free space available, your system may start to bog down and feel slow because it's not running efficiently.
You can empty whatever is currently in the Trash by doing a click-hold (or right-click) on the "waste basket" icon in the Dock, and selecting Empty Trash.  A good place to look for files you may no longer need is your Downloads folder.  There is usually a link to your Downloads folder in the sidebar of a Finder window.  (The folder itself is located in your user home folder.)
You can see how much free space you currently have by selecting Macintosh HD on your Desktop (or in the sidebar of a Finder window), and selecting Get Info from the File menu.  You can also right-click on it and select Get Info from the menu that comes up (or hit Cmd-I on keyboard).  The Info window shows Capacity and Available for the volume.  Available is the free space.  It would be best to keep Available at least 10% of Capacity; getting it to 20% or more would be better.
If you can't free up enough free space by deleting things you do not need anymore, you should get an external hard drive and save some your files there.  That's actually how I run my iMac; most of my user files are stored on external USB and FireWire drives.