Intel KM4AM - Manual (Page 26)

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MS-6734 M-ATX Mainboard
Hard Disk Connectors: IDE1 & IDE2
The mainboard has a 32-bit Enhanced PCI IDE and Ultra DMA 33/66/100/133 controller
that provides PIO mode 0~4, Bus Master, and Ultra DMA 33/66/100/133 function. You
can connect up to four hard disk drives, CD-ROM, 120MB Floppy (reserved for future
BIOS) and other devices.
IDE1 (Primary IDE Connector)
The first hard drive should always be connected to IDE1. IDE1 can connect a
Master and a Slave drive. You must configure second hard drive to Slave
mode by setting the jumper accordingly.
IDE2 (Secondary IDE Connector)
IDE2 can also connect a Master and a Slave drive.
IDE1 IDE2
MSI Reminds You...
If you install two hard disks on cable, you must configure the second
drive to Slave mode by setting its jumper. Refer to the hard disk
documentation supplied by hard disk vendors for jumper setting
instructions.