sj_digriz,
SCSI includes SATA drives whe you are using the SATA driver in the SCSI branch of the kerenl.
SCSI Drives are called /dev/sda, /dev/sdb and so on. When you run fdisk you use
to partition the first SCSI drive.
Whe you partition the drive you can create either a maximum of four primary partitions or three primary partitions and a single extended partition. These partitions are numbered from 1 to 4. They are referenced as /dev/sda1, /dev/sda2 and so on on the first SCSI drive and /dev/sdb1, /dev/sdb1 etc. on the second SCSI drive.
You make filesystems on partitons with the various make filesystem tools.
creates an ext2 filesystem on parttion 1 of the first SCSI drive, such as you may use for /boot.
marks a partition as a swap partition.
makes an ext3 filesystem, on the 3rd partition of the first SCSI drive.
/dev/sda1 is not a drive. Its a partition. Windows tends to blurr the difference since left to its own devices, it creates a single partition that fills the whole drive.
Run
(thats a lowercase letter L for list) to see how /dev/sda is partitioned now.
If windows is installed on that drive, repartitioning it will destroy windows unless you shrink the windows partition first.