I have two partitions: C: and D: (shown in Windows).
Then I installed Ubuntu and found out that /dev/sda represents a SCSI disk and a number after sda represents a partition.
Now, I assumed I have 2 partitions: /dev/sda and /dev/sda1 (one for C:, the other for D:), but this is not the case.
I have sda, sda1, sda2, sda3.
Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x3b7e273f Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 206848 266242047 133017600 7 HPFS/NTFS/exFAT /dev/sda3 266242048 976771071 355264512 7 HPFS/NTFS/exFAT
which explains all sda's except sda1.
What's happening on sda1? What is it used for?