|Thanks Richard59 & OtheHill|
In fact I'm using the Windows OS on my MacBook (dual boot).. The Windows partition is Fat32, so Mac can see it!
I bought the external HDD to download the Linuxs' but I can download them on Mac only because Widows Fat32 doesn't accept files larger than 4GB.
For that, I ll keep 2 partitions Fat32 to store Mac files, and NTFS partitions for files larger than 4GB.
Another question plz, what is the best way to re-format one partition of my external HDD from Fat32 to NTFS?.
Thanks a lot