SATA 3 is backwards compatible, it means you connect it the same way as SATA 1.
SATA hard disks are basically hard drives or optical disk drives. The prices an SATA hard disk for them vary from $50 to $200. They can be found on a variety of websites online.
molex for IDE devices and sata power connector for SATA devices
hard disk
Not necessarily. "ATA-150" is SATA. If your motherboard has an IDE controller, the disk will work. If the board has only SATA, you will not be able to connect the drive without an adapter.
to make the computer function
It depends. If it is a laptop hard disk, and you know the interface (IDE or SATA, there is a difference), you would purchase a 2.5" IDE/SATA Hard Disk Enclosure. If it is a desktop hard disk, and you know the interface (IDE or SATA, there is a difference), you would purchase a 3.5" IDE/SATA Hard Disk enclosure. Hopefully this helps.
Sata of course. It is much much better/faster/economical.
There are two types of Hard disk. 1:Sea gate disk 2:SATA Hard disk
Yes, you can. If your computer has more sata ports you can use then to connect more hard drives.
1. IDE Hard Disk 2. SATA Hard Disk 3. SCSI Hard Disk 4. Ultra SCSI Hard Disk
IDE hard disk, SCSI hard disk, SATA hard disk, External hard disk, it is also differ by RPM speed for the HADD. I hope that helpes.
Connect the hard drive from your old computer to any new computer which has a required port (EIDE, SATA...).