Hi.
It is possible to hook an atari scsi drive to a pc it it is properly partitioned. It has to be readable both under pc and atari. Afaik only hddriver by uwe seimet does this.
If you haven't installed hddriver i'd suppose you use things as ghostlink (serial nullmodem) or a network card for your atari. With a romport interface you can use certain isa-cards to connest your atari to a lan.