Make a Small 100MB partition and format it as fat. Make the rest an EXT3 filesystem.
Partition 1 == Fat
Partition 5 == EXT3
Put the Read/Write Software for EXT2/3 on the FAT partition so Windows can read the EXT2 partition. MACs can also benefit from this.
Then format the Filesystem with a Linux machine/cd/whatever.
That way, you can always have the machine read the first partition and then install the Software, then be able to read the fifth partition.
Maximum funliness that way.