look at /var/log/messages or dmesg when you attach the drive, it should print the device name assigned to the drive. You can also run "fdisk -l" to get the device name and partition layout. Once you know the name of the partition you want to mount, make a directory for it and mount it
mount /dev/sdb1 /mnt/temp #replacing /dev/sdb1 with the name of the partition you want to mount
Or any of the other 3.8 million matches when you search Google for "mounting a drive in linux"