Determine the setup you want. There are two main ways to use multiple hard drives on a single computer:
You can install additional hard disks on a desktop computer. This setup requires that you set up each drive as a separate storage device or connect them with a RAID configuration, a special method for using multiple hard drives. Hard drives in a RAID setup require a motherboard that supports RAID. The hard drives store data in combination or mirror one another to back up duplicate data on multiple hard disks.
Configure the RAID utility. Turn on your computer. During start up, your screen will display which keys you need to press in order to access the RAID utility program (usually "F4" or another function key). From the utility program, you can configure your hard drives into one of the following hard-drive arrays:
RAID 0: This configuration splits information across multiple hard drives in a setup known as "striping," treating them all like one large hard drive. This configuration can speed up your computer's performance.
RAID 1: This configuration makes one hard drive "mirror" another hard drive, creating an exact copy for back up purposes. RAID 1 has the advantage of safeguarding your data in case one hard drive fails.
Other RAID configurations: Hard drives can be combined in more advanced setups, and each of them has different benefits and limitations; but they are usually used by very advanced users with larger numbers of hard drives.
Exit the RAID utility and reboot. Once your computer restarts, you can check the directory to see your new hard-drive combination. The two hard drives will display as a single large internal hard drive for your computer, and you can start copying data and installing programs to that drive.
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