Context: Like other digital music players, iPods can serve as external data storage devices. Storage capacity varies by model, ranging from 2 GB for the iPod Shuffle to 128 GB for the iPod Touch (previously 160 GB for the iPod Classic, which is now discontinued).

Question: In addition to playing music, what other function can the iPod perform?
Answer: data storage

Question: What is the smallest data capacity for an iPod product?
Answer: 2 GB

Question: What is the largest data capacity for an iPod product?
Answer: 128 GB

Question: Which iPod product features the smallest data storage capacity?
Answer: iPod Shuffle

Question: Which current iPod product features the largest data storage capacity?
Answer: iPod Touch

Question: What's the storage capacity of the iPod Shuffle?
Answer: 2 GB

Question: What's the storage capacity for the iPod Touch?
Answer: 128 GB