AtvCloner 0.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is DynaFlash Tech.
We recommend checking the downloaded files with any free antivirus. The bundle identifier for this app is com.dynaflash.AtvCloner. The most popular versions of the software are 0.2 and 0.1. The AtvCloner installer is commonly called AtvCloner_0_1_9.zip.
From the developer:
AtvCloner is a Macintosh application that can be used to properly image the AppleTV1* hard drive and then partition a new drive for upgrading/replacing the built in hard drive in the AppleTV. This software will not work on the AppleTV2. AtvCloner is tested using Mac OSX Leopard (10.5.xx) through Mac OSX Snow Leopard (10.6) but will not work with 10.4 Tiger.