both FAT32 and NTFS are for originally windows based machines. Mac can address both kinds but not "run" from them.
To run Mac OS you need an HFS+ partition. (probably also need a swap partition, usually Mac OS does all this for you, this guess of mine is based on how Linux systems are setup).
If running more then one OS on a dell with MAC OS can be tricky, only 4 primary disc partitions can be created. (at least with my linux and windows experience).
To format to HFS+ see the program listed in your other question. Simply creating an HFS+ partition may not be enough.....