[nmglug] usb drive

[BrianO'Keefe]

Hopefully someone can help on this. I'd posted about my weird usb drive 
experience and now I have another issue.
I have a Fantom drive, 160GB with 3 partitions. One is extfs and the 
others are hfs journalled for my OS X partition backup and my wife's 
iBook backups. I have divide it so that the Linux partition is 40GB. I 
have about 6GB of data on it but it is showing only 7GB of free space. I 
double checked the drive with OS X disk utility and it actually has 40GB 
capacity so I wonder where all the free space is. Any ideas on how to 
check this. What Linux utility is equivalent to Mac Disk utility?
Thanks