Epson Endeavor - Manual (Page 77)

Setting the Hard Disk Drive Jumpers
Most hard disk drives have jumpers that must be set for the
drive to work properly with the computer. The jumpers tell the
computer whether you are using one hard disk drive or two. If
you purchased your computer with a hard disk drive already
installed, these jumpers have been set correctly for your system.
If you install a hard disk drive in your computer, be sure to
check the drive’s jumper settings before you install it. See the
documentation that came with your drive for the proper
settings, then follow the instuctions below.
If you install a second hard disk drive, you must set the
jumpers on both drives to indicate which drive is the master
(primary) drive and which is the slave (secondary) drive. A
master drive is the drive on which you’ll install the operating
system that the computer loads into its memory each time you
turn it on. You can run application programs and store data on
both the master and slave drive, but the operating system must
be on the master drive.
Where to Go Next
To install a hard disk drive in the vertical drive bay, see the
next section. To install a hard disk drive in the lower horizontal
drive bay, see “Installing a Drive in a Horizontal Bay” on page
3-l7.
3-4 Installing and Removing Drives