I am thinking about buying a hard drive and a SATA to eSATA cable to get more space to store things but I dont know whether or not the eSATA cable supplies power to the hard drive like a USB port. Do I have to buy a power cable for the hard drive or will it work without one?
as far as i know you dont need anything but a SATA cable and it will power up.
I use an external sata for backup with a usb cable converter the power comes from the usb cable, esata I suspect would be similar unless you are hooking it up with arj45 or something?
eSATA connectors cannot supply power, require a power supply for the external device. eSATAp (but mechanically incompatible, sometimes called eSATA/USB) connector adds power to an external SATA connection, so that an additional power supply is not needed.