Media vs /dev/sd1?

[Robert Hemus]

Gents & Susan if she's reading this,

How do you correlate Media to /dev/hda or sda ?  I've run an fdisk to
see what the size of the partitions are, but this changes from Media to
the size of the fdisk command gives.  Then at the bottom of
fdisk /dev/sdc there is a line "Partition table entries are not in disk
order".  Where can I read about "Media" as opposed to /dev/?
Dumb Bob