i have a Rosewill RX25-AT-SC-SLV i am able to get it running with just usb when i connect esata it doesn't work. i know the cable works fine, i have all chipset drivers installed correctly, my bios setting for esata is set at ahci, but i had it at ide before. so when it was at ide i would have the usb connected and it worked correctly but when i connect the esata cable usb dismounts from pc and cannot see it from device manager. yes the hard drive is formatted properly. does it have to be a specific file system? fat32 ntfs or exfat? i know my ports work fine because i have use it on another external combo before.