.dmgs threw me for a loop the first time I tried a Mac, as well. If somebody had just told me "they're compressed loopback devices" I would have understood (I

.dmgs threw me for a loop the first time I tried a Mac, as well. If somebody had just told me "they're compressed loopback devices" I would have understood (I was coming from Linux), but I was expecting them to be like tarballs and spent a while confused.