It seems really silly to pay somebody to do this when you can just use OSX's built-in functionality. Create a plain-text file with the following commands in it:

#!/bin/sh
NUMSECTORS=524288
# 64mb = 131072
# 128mb = 262144
# 256mb = 524288
# 512mb = 1048576
# 1gb = 2097152
mydev=`hdid -nomount ram://$NUMSECTORS`
newfs_hfs $mydev
mkdir /tmp/ramdrive
mount -t hfs $mydev /tmp/ramdrive

Save the file with a name like 'mkramdisk.sh', and give it executable permissions:

chmod 755 mkramdisk.sh

Run it. Voila. This script is right out of the man page for hdid. You can also read about doing this at

http://www.kernelthread.com/mac/osx/arch_fs.html

K