Mac OS X Puma build 5D15

Mac OS X Puma build 5D15 is the first beta build of Mac OS X Puma 10.1. This build includes notable updates to the Disk Utility and support for EarthLink when registering.

This build is commonly mislabeled as build 5G15 from many sources. The 5G15 mislabel might've originated from CNET.