partition

[emorfin@caracol.red.cinvestav.mx]

Hi!

my partition on my tibook disk:

/dev/hda
        #                    type name                  length   base      ( size )  system
dump: name /dev/hda len 8
/dev/hda1     Apple_partition_map Apple                     63 @ 1         ( 31.5k)  Partition map
/dev/hda2         Apple_Bootstrap bootstrap               1600 @ 64        (800.0k)  NewWorld bootblock
/dev/hda3         Apple_UNIX_SVR2 swap                  524288 @ 1664      (256.0M)  Linux swap
/dev/hda4         Apple_UNIX_SVR2 root                25165824 @ 525952    ( 12.0G)  Linux native
/dev/hda5         Apple_UNIX_SVR2 home                16395360 @ 25691776  (  7.8G)  Linux native
/dev/hda6               Apple_HFS MacOSX              66524736 @ 42087136  ( 31.7G)  HFS
/dev/hda7              Apple_Free Extra                8598368 @ 108611872 (  4.1G)  Free space

Block size=512, Number of Blocks=117210240
DeviceType=0x0, DeviceId=0x0

as you can see, i have hda7 as free space.

I want to use it to share data.

What do you recomend? hfs or ufs?

How can i do it?

If i try to do in osX (disk utility) it tells me he can't do anyting to the disk.
If i try to use osX install cd, it tells me all partitions would be 
erased, so i cancel the changes.

How can i do it in linux? (change the partition system and format it)

Thanks