All drives (IDE, SATA, USB, etc) are now using the sdX naming convention, the hdX names are no longer used. The same rules apply as before though, new drives will be given alphabetical designation. It doesn't matter if one is IDE and one is SATA, they will still be sda and sdb.
But it seems like you are saying that both drives are trying to take sda? How do you know this is happening? Is there some error message or system log you can provide which explains the situation?