I have a seagate external 1.5 tb hd that I formatted using disk doctor under mac os journaled and would like to make a windows dos partition, is it possible? I have used about 700 gb allready would it affect my files?
The best deal is to partition the drive prior to formatting the partitions. There are a couple of solutions:
1) Back up the existing data to another drive and start over.
2) Use a partitioning utility. While I am sure there are many out there, you can check out http://www.versiontracker.com/dyn/moreinfo/macosx/23828
The use of option two will allow you to add another partition without starting over, but you should always back up data before attempting such an exercise, which makes option 1 advisable.