This Knowledgebase article does not apply to Mac computers running Boot Camp. The partition configuration of the system hard disk on a Boot Camp system is fully supported.
Dual-formatted hard disks, or devices with multiple different partition types, are not supported. For example, a device with one FAT32 partition and one HFS+ partition, or two HFS+ partitions and an NTFS partition, has multiple partition types. Neither Windows nor MacDrive will be capable of working with a drive configured in this manner.
Devices used with MacDrive can have multiple Mac partitions (HFS+, HFS+J, HFSX, and so on).
With MacDrive installed you won't need to use two different formats (e.g. FAT32 and HFS+) to use your drive on both computers. MacDrive enables your Windows PC to seamlessly work with HFS/HFS+ disks.