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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 ?

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    each operating system uses its own convention; grub could be considered to be an operating system... – wurtel Dec 16 '15 at 10:44
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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

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    /dev/sda isn't necessarily sata0 ( if that designation can even be said to have meaning ).. it's just the first scsi compliant drive ( which sata drives kinda sorta are ) that finished being probed. It can often be a usb flash stick you had plugged in at boot as they tend to detect faster than hard disks, or the third sata drive on your second sata controller. – psusi Dec 17 '15 at 0:03
  • And in which case do we refer to as sd0 and not sda? – Kenny Dec 17 '15 at 14:33

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