Highlander4BR

I have an st31500341as, p/n 9JU138-302 and firmware: CC1H with 3 partitions of 500GB, when i turn it on as an external HD, windows 7 recognize each partition as RAW and 100% free space (but all of 3 partitions have a lot of data), and few seconds later they disappear from the Storage Disk Management monitoring. The main problem now is that i can't communicate to the HD by hyperterminal to send the commands and follow the procedure to fix BSY error I've read since the beginning of this forum. When i hit "Ctrl Z" it doesn't prompt to communication. I've already change position of Rx and Tx for make sure and do nothing, the 5V is ok. Is there any step i can try for beginning the communication with hyperterminal? Thanks!