Difference between sd0/sda, hd0/hda From what I understand, `hdx` is naming convention for IDE (PATA) drive, `sdx` is for SCSI (SATA) drive. Sometimes I see sd0 and sda, similary hd0/hda. What are their differences ? When would we use number in naming such as sd0 or hd0 ? It seems that (hd0, x) is only used by GRUB, is that correct ?

hd0 - is a Linux grub2.gfg/grub.conf designation of hard drive 0, even it is sata

`/dev/sd0s1` \- usualy a name of first slice in FreeBSD OS on sata0

`/dev/sda1` \- a name of Linux partition on sata0