If your iPod previously used on a Windows computer isn’t syncing with a Mac, you need to check the Disk Format on your iPod.
On iTunes, go to Devices and click on the iPod. It will display the Name, Capacity, Software Version, Serial Number and Format. The format can be PC or Macintosh and needs to be equal to the computer you’re using.
To change the Disk Format on your iPod, click on the button Restore
On the manual of a Mac Mini late 2010 model, Apple recommends using a 1066MHz DDR3 SODIMM memory to upgrade the memory.
I’ve tried using a Kingston KVR KVR1333D3S9/4G but it ended up beeping whenever I tried to put the top memory stick.
I tried using Markvision BMD34096M1333C9-1121 and it worked perfectly as you can see below