What format for my external harddrive?

Hello,
I have a 1,5 TB Seagate external harddrive.
What format and partitiontype shall it be to be used on both Mac and Windows?
Because right now it only works on my mac and the rest of my family uses Windows so i would like to share my ext. hdd with them aswell..
Right now it's Mac os Extended Journaled and Apple-partitiontype..
Help Please :-)

Not quite sure I understand but here is what Disk Utility Help says about partitioning a disk:
Partition a Disk
1. If you’re partitioning an external disk, make sure it’s connected to your computer.
2. Open Disk Utility.
3. Select the disk that you want to partition and click Partition.
4. Choose the number of partitions from the Volume Scheme pop-up menu.
If you can’t choose the number of partitions, follow the steps for partitioning a startup disk.
5. Click each partition and type a name for it, choose a format, and type a size.
You can also drag the divider between the partitions to change their sizes. If a partition’s name has an asterisk beside it, it’s shown larger than its actual size in order to display its name clearly.
6. Click Options and choose one of the following:
If you’ll be using the disk on a Windows computer, choose the Master Boot Record partition scheme (also known as “fdisk”).
If you’ll be using the disk only with Mac computers, choose GUID Partition Table.
7. Click Apply.

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