Assuming it is your Primary Slave device (/dev/hdb)
Create a few primary partitions on it using "fdisk /dev/hdb"
"n"ew, "d"elete, "t"type (to change partition types, IE fat32, linux, etc), "p"rint "q"uit (WITHOUT saving changes), "w"rite (DOES save changes)
When you are done simple "mkfs -t ext3 /dev/hdb3" (mkfs means format "-t ext3" means as a linux filesystem "/dev/hdb3" means do this to the primary slave's third partition). If you dual boot between windows and Linux, I suggest setting one partition up as "FAT32" to share files between the two OS's.
"/dev/hdc" is Secondary master
"/dev/hdd" is Secondary slave
Then you just create a "mountpoint" (nothing more than a directory) "mkdir /file_share" and then "mount /dev/hdb3 /file_share" and the partition is now "mounted" and ready for use.
Until the next reboot that is
But, there's an easy way to have it automatically mounted every time you boot Linux, automatically!
just edit "/etc/fstab" and add a line
"/dev/hdb3 /file_share ext3 defaults 0 0"
save the file, and you are done!
(repeat as needed)