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Date: Sun, 05 Jan 2014 13:02:01 -0500
From: Jim Salter <jim@jrs-s.net>
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To: linux-btrfs@vger.kernel.org, "dhan.war" <wardhan.v.1.0@gmail.com>
Subject: Re: how to properly mount an external usb hard drive & other questions
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On 01/05/2014 12:50 PM, Justus Seifert wrote:
> oh i forgot: if you want to mount it without su privileges you have to 
> use:
>
> /dev/sdc /path/to/your/favorite/mountpoint compress,noauto,users,user 0 0
If you want LZO compression, as you specified:

           /dev/sdc /path/to/mountpoint compress=lzo,noauto,users,user 0 0

Better yet, if your btrfs is actually on /dev/sdc right now, let's get 
that fstab entry mounting it by UUID instead.

           ls -l /dev/disk/by-uuid | grep sdc
           lrwxrwxrwx 1 root root 10 Jan  3 09:40 
12345678-9abc0-1234-5678-9a0123456789 -> ../../sdc

So then:

           # this is not a real UUID, you need to check 
/dev/disk/by-uuid on your machine for a real UUID
           UUID=12345678-9abc0-1234-5678-9a0123456789 
/path/to/mountpoint   compress=lzo,noauto,users,user   0   0

This is EXTRA important with a USB drive, since it's HIGHLY likely it 
won't always be on the same physical devicename.