Apple Watch has 8GB of storage, but you can't use it all yet
If you're planning to listen to music on the Apple Watch while you go running, you may need to keep your expectations in check. Apple tells 9to5Mac that the wearable has 8GB of built-in storage (twice as much as a typical Android Wear watch), but that there are set limits on how much media you can store. Only 2GB is available for music, so don't think of stuffing in a gigantic exercise playlist. In practice, you're looking at about 200 to 250 songs at the 256Kbps quality you get from the iTunes Store. There's also just 75MB of space for photos, although that won't matter as much given that the Watch both limits you to favorite photos and resizes images to match the smaller display.
http://www.engadget.com/2015/03/10/a...s-8gb-storage/
