I have an external USB drive from acomidata. I formatted it NTFS and used it on my PC for months. When I take it to other computers, one of two things happen: 1) It works fine, just like at home. 2) It will not assign the drive a letter, and going into disk management launches the initialize disc wizard to convert to a dynamic disc... The drive has been properly partitioned and works on about half the windows systems I connect it to. However- seemingly at random- some systems refuse to see the drive and attempt to initialize. I've searched around to find out if A) this will erase the drive and B) WHY or IF it needs to be dyanmic-- but I can't find a straight answer on either... Anyone have ideas?