Drive Setup performs other routines that Erase disk does not. Erase disk will only initialize the Partition selected. Drive Setup Initialize will reset the Boot Block and Partition Map as well as the Partition(s) selected.
Note: Drive Setup Initialize will erase the entire hard disk. A single partition can not be selected for initialization.
If you are using third party hard disk software, and you wish to use Mac OS Extended format, please consult the utility's documentation, or contact the vendor for compatibility information regarding Mac OS Extended format.
The Knowledge Base article 17159: "
Locating Vendor Information" can help you search for a particular vendor's address and phone number.