Western Digital 320gb "not readable" by Mac OS

I plug my Western Digital My Passport 320gb drive into my eMac, and I get the message "the disc you inserted is not readable by this computer."
It works fine on Windows XP and my Eee PC 701 (running the default Xandros OS.)
Can anyone help? Thanks in advance.

It's FAT32, I assume that's what you meant.
It appears in Disk Utility before I get the error message. The Get Info box says:
Name : WD 3200BMV External Media
Type : Disk
Disk Identifier : disk1
Media Name : WD 3200BMV External Media
Media Type : Generic
Connection Bus : USB
Connection Type : External
USB Serial Number : 57442D575845333039553038363036
Writable : Yes
Ejectable : Yes
Mac OS 9 Drivers Installed : No
Location : External
Total Capacity : 298.1 GB (320,072,933,376 Bytes)
S.M.A.R.T. Status : Not Supported
Disk Number : 1
Partition Number : 0
Not sure what I need to do now. Thanks very much for the reply.

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