The other day I was using df -h to check disk space usage, and was surprised to see some odd entries in the output:
$ cd /Volumes $ df -h ... /dev/disk2s3 75Gi 51Gi 24Gi 69% /Volumes/datafiles map -hosts 0Bi 0Bi 0Bi 100% /net map auto_home 0Bi 0Bi 0Bi 100% /home ...I had no idea what the map entries were there for; they don't show if you simply do ls /Volumes. After inquiring around, a friend managed to find the answer for me: they're related to the autofs feature in 10.5 and 10.6. You can read all about it, if you care, in this Apple PDF. I was more curious than alarmed, as I hadn't remembered seeing those entries before (I don't use df -h folder all that often).
Mac OS X Hints
http://hints.macworld.com/article.php?story=20100129064205981