On several drives, HPFSRem v1 will report an error when trying to insert and/or remove a disk. So long as the only error occurs while trying to insert a disk, there should be no problem (telling HPFSRem to insert is usually unessasary). Otherwise, attempting to use the disk may cause a system crash. I'm working on this the best I can, but I need help from people with the afflicted drives. HPFSRem works fine on my system, so I can't figure out what's wrong without a little help.
HPFSRem v1.1 seems to fix these problems. If it doesn't, please email me.