Problems after formatting external drive

I have recently formatted a partition on my external WD drive. One partition has mac os x extended file system on it as a format, the other I formatted using a PC, as the NTFS file system. When I plug into the Mac both show up, but no information can be exchanged between the PC part of it. I get a message saying the drive can't be modified. I want to try and format it again with my Mac but I can not access it through the system utility as a single drive. Meaning it won't let me do anything with the PC itself. Now if I highlight the entire Hard drive, I can only partition it. I have locked the Mac portion of it and would like to format the other half as MS-DOS file system but am worried about loosing information on the Mac part of it. If I format can the info on the locked portion be saved or does the entire drive get partitioned. Thanks

Hi
Let me confirm - if you go into Disk Utility on the Mac, select the NTFS partition on the left, go to the Erase tab, you are NOT able to change the format to MS-DOS and re-format? Is the "Volume Format" option greyed out?
That would not affect the Mac partition. Re-partitioning the drive using the Partition tab would wipe all data from all partitions.
Matt

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